| 单词 | alveolus |
| 例句 | The lungs' alveoli are described as "the Customs Agents of a tiny, invisible land ... the Border Guards inspecting goods moving from the Great Unbounded Nether Wilderness of Outside ... Inside." 'Things to Do in a Retirement Home Trailer Park' gives graphic form to dying 2016-01-08T05:00:00Z However, it rarely affects the bronchi and alveoli in the lungs. Discovery concerning receptors used by coronaviruses to enter human cells 2023-10-27T04:00:00Z Lung alveoli are the small air sacs where oxygen and CO2 exchange between the lung and blood takes place, and the major site of radiation pneumonitis. Human Lung Chip leveraged to faithfully model radiation-induced lung injury 2023-10-17T04:00:00Z The alveoli also contain other cells known as type II pneumocytes. Fundamentals of Biology 2015-01-01T00:00:00Z The alveoli are thin-walled and look like tiny bubbles within the sacs. Concepts of Biology 2013-04-25T00:00:00Z Fibrosis thickens the walls of the alveoli, which makes gas exchange with the blood more difficult. COVID's lasting lung damage 2022-11-11T05:00:00Z You can exhale without muscle action by letting surface tension in the alveoli create its own positive pressure. College Physics for AP Courses 2015-08-12T00:00:00Z Numerous alveoli and alveolar sacs surround the alveolar ducts. Biology for AP Courses 2022-06-09T00:00:00Z These cells secrete a substance known as surfactant that helps to decrease the surface tension in the alveoli. Fundamentals of Biology 2015-01-01T00:00:00Z The alveoli are in direct contact with capillaries of the circulatory system. Concepts of Biology 2013-04-25T00:00:00Z Finally, even when air flow and lung volume are unaffected, the lungs cannot complete their function if blood flow to the alveoli, where gas exchange occurs, is impaired. COVID's lasting lung damage 2022-11-11T05:00:00Z This reduced velocity allows the blood to exchange substances with the cells in the capillaries and alveoli in particular. College Physics for AP Courses 2015-08-12T00:00:00Z Such intimate contact ensures that oxygen will diffuse from alveoli into the blood and be distributed to the cells of the body. Biology for AP Courses 2022-06-09T00:00:00Z At the time of birth, the baby has lactiferous ducts but no alveoli. Fundamentals of Biology 2015-01-01T00:00:00Z Such intimate contact ensures that oxygen will diffuse from the alveoli into the blood. Concepts of Biology 2013-04-25T00:00:00Z The partial pressure of oxygen in the affected alveolus increases. Anatomy and Physiology 2013-06-19T00:00:00Z Our lungs contain hundreds of millions of mucus-lined sacs called alveoli, which are very similar in size, and about 0.1 mm in diameter. College Physics for AP Courses 2015-08-12T00:00:00Z In addition, the carbon dioxide that was produced by cells as a waste product will diffuse from the blood into alveoli to be exhaled. Biology for AP Courses 2022-06-09T00:00:00Z The exact function of the alveolus is unknown, but it may be involved in osmoregulation. Fundamentals of Biology 2015-01-01T00:00:00Z Gas exchange between the lungs and blood takes place in the alveolus. Concepts of Biology 2013-04-25T00:00:00Z Each tooth is anchored into a deep socket called an alveolus. Anatomy and Physiology 2013-06-19T00:00:00Z Even if there is paralysis, surface tension in the alveoli will expel air from the lungs. College Physics for AP Courses 2015-08-12T00:00:00Z However, lungs never fully deflate with an exhalation; therefore, the inspired air mixes with this residual air and lowers the partial pressure of oxygen within the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z The alveolar ducts and alveoli are lined with simple squamous epithelium that allows for gas exchange. Fundamentals of Biology 2015-01-01T00:00:00Z The respiratory bronchioles open up into the alveolar ducts, alveolar sacs, and alveoli. Concepts of Biology 2013-04-25T00:00:00Z The alveoli of lungs where gases diffuse, segments of kidney tubules, and the lining of capillaries are also made of simple squamous epithelial tissue. Anatomy and Physiology 2013-06-19T00:00:00Z Since pressure increases as the radii of the alveoli decrease, an occasional deep cleansing breath is needed to fully reinflate the alveoli. College Physics for AP Courses 2015-08-12T00:00:00Z CO2 diffuses down its pressure gradient, moving out of the capillaries and entering the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z These alveoli join up to form groups known as lobules, and each lobule has a lactiferous duct that drains into openings in the nipple. Fundamentals of Biology 2015-01-01T00:00:00Z Describe the function of these terms and describe where they are located: main bronchus, trachea, alveoli. Concepts of Biology 2013-04-25T00:00:00Z Pulmonary alveoli open, and alveolar capillaries fill with blood. Anatomy and Physiology 2013-06-19T00:00:00Z During exhalation, the molecules slide back together and the surface tension decreases, helping to prevent a collapse of the alveoli. College Physics for AP Courses 2015-08-12T00:00:00Z In short, the change in partial pressure from the alveoli to the capillaries drives the oxygen into the tissues and the carbon dioxide into the blood from the tissues. Biology for AP Courses 2022-06-09T00:00:00Z True secretory alveoli only develop in pregnancy, where rising levels of estrogen and progesterone cause further branching and differentiation of the duct cells, together with an increase in adipose tissue and a richer blood flow. Fundamentals of Biology 2015-01-01T00:00:00Z How does the structure of alveoli maximize gas exchange? Concepts of Biology 2013-04-25T00:00:00Z Moreover, in response to progesterone, clusters of breast alveoli bud from the ducts and expand outward toward the chest wall. Anatomy and Physiology 2013-06-19T00:00:00Z The surfactant therefore serves to change the wall tension so that small alveoli don't collapse and large alveoli are prevented from expanding too much. College Physics for AP Courses 2015-08-12T00:00:00Z The blood is then transported to the lungs where differences in pressure in the alveoli result in the movement of carbon dioxide out of the blood into the lungs, and oxygen into the blood. Biology for AP Courses 2022-06-09T00:00:00Z My senses seemed supersensitive and I was sure I could hear their food going down, their corpuscles moving through their bloodstreams, their alveoli inflating and deflating. Perspective | Strangers on a plane: Vaxxed and masked, I recently rejoined humanity 2021-05-24T04:00:00Z Gas exchange between the lungs and blood takes place in the alveolus. Concepts of Biology 2013-04-25T00:00:00Z Milk is secreted from the lactocytes, fills the alveoli, and is squeezed into the ducts. Anatomy and Physiology 2013-06-19T00:00:00Z This ensures that small alveoli don't collapse and large alveoli are not able to over expand. College Physics for AP Courses 2015-08-12T00:00:00Z The respiratory rate contributes to the alveolar ventilation, or how much air moves into and out of the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z With each inhale, air coursed into the branches of her lungs and terminated in the alveoli, nearly 500 million air sacs surrounded by capillaries, where an exchange of oxygen and carbon dioxide occurs. She was dying of COVID-19. Her last hope was a Hail Mary that would save her or kill her 2021-03-12T05:00:00Z At the end of each duct are alveolar sacs, each containing 20 to 30 alveoli. Concepts of Biology 2013-04-25T00:00:00Z Clusters of alveoli that drain to a common duct are called lobules; the lactating female has 12–20 lobules organized radially around the nipple. Anatomy and Physiology 2013-06-19T00:00:00Z Surface tension in the alveoli creates a positive pressure opposing inhalation. College Physics for AP Courses 2015-08-12T00:00:00Z Alveolar ventilation prevents carbon dioxide buildup in the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z But the virus was choking off the alveoli, one by one, so that Lopez breathed faster and needed a higher concentration of oxygen. She was dying of COVID-19. Her last hope was a Hail Mary that would save her or kill her 2021-03-12T05:00:00Z In addition, carbon dioxide will diffuse from the blood into the alveoli to be exhaled. Concepts of Biology 2013-04-25T00:00:00Z When the infant suckles, sensory nerve fibers in the areola trigger a neuroendocrine reflex that results in milk secretion from lactocytes into the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z The alveoli in emphysema victims are damaged and effectively form larger sacs. College Physics for AP Courses 2015-08-12T00:00:00Z Flow-resistive refers to the work of the alveoli and tissues in the lung, whereas elastic work refers to the work of the intercostal muscles, chest wall, and diaphragm. Biology for AP Courses 2022-06-09T00:00:00Z Molecules of carbon dioxide and oxygen changed places, just as they do in the alveoli, and the blood flowed back into her body through the other cannula, a brighter and lighter red. She was dying of COVID-19. Her last hope was a Hail Mary that would save her or kill her 2021-03-12T05:00:00Z But one autopsy finding was of note: acute lung injury that included bleeding in tiny air sacs called alveoli. A Family’s Search for Answers: Did Their Brother Die of Covid? 2021-03-07T05:00:00Z In addition, fetal breathing movements may help alveoli to form and mature. Anatomy and Physiology 2013-06-19T00:00:00Z Construct a problem in which you calculate the loss of pressure due to surface tension in the alveoli because of their larger average diameters. College Physics for AP Courses 2015-08-12T00:00:00Z Surfactant is a complex mixture of phospholipids and lipoproteins that works to reduce the surface tension that exists between the alveoli tissue and the air found within the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z When we breathe in these particles, they travel down the airway and settle in the tiny air sacs called alveoli of the lungs, causing inflammation and potentially worsening asthma symptoms. What Climate Change Does to the Human Body 2020-08-29T04:00:00Z The delicate alveoli, which gather oxygen essential to the body, become inflamed and struggle to do their job. Monster or Machine? A Profile of the Coronavirus at 6 Months 2020-06-02T04:00:00Z A type I alveolar cell is a squamous epithelial cell of the alveoli, which constitute up to 97 percent of the alveolar surface area. Anatomy and Physiology 2013-06-19T00:00:00Z Among the things to consider are the normal surface tension of the fluid lining the alveoli, the average alveolar radius in normal individuals and its average in emphysema sufferers. College Physics for AP Courses 2015-08-12T00:00:00Z By lowering the surface tension of the alveolar fluid, it reduces the tendency of alveoli to collapse. Biology for AP Courses 2022-06-09T00:00:00Z In the lungs, this breaks down collagen and elastin in the extracellular matrix — the scaffold that supports the grape-like structures known as alveoli. Research round-up: COPD 2020-05-12T04:00:00Z In patients with severe cases of COVID-19, the virus attacks the lungs, causing fluid to collect in tiny air sacs called alveoli. Becoming ‘King of Ventilators’ may result in unexpected glut 2020-05-10T04:00:00Z A type II alveolar cell is interspersed among the type I cells and secretes pulmonary surfactant, a substance composed of phospholipids and proteins that reduces the surface tension of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z Like SARS-CoV and influenza, it infects and destroys the alveoli, the tiny sacs in the lungs that shuttle oxygen into the bloodstream. Profile of a killer: the complex biology powering the coronavirus pandemic 2020-05-03T04:00:00Z Surfactant is also important for preventing collapse of small alveoli relative to large alveoli. Biology for AP Courses 2022-06-09T00:00:00Z In pneumonia and in ARDS, fluids in the lungs fill microscopic air sacs called alveoli, where oxygen from the air diffuses into the blood. 'Silent hypoxia' may be killing COVID-19 patients, but there's hope 2020-04-28T04:00:00Z The thinner, distant branches of the lung’s respiratory tree end in tiny air sacs called alveoli, each lined by a single layer of cells that are also rich in ACE2 receptors. How does coronavirus kill? Clinicians trace a ferocious rampage through the body, from brain to toes 2020-04-17T04:00:00Z Roaming around the alveolar wall is the alveolar macrophage, a phagocytic cell of the immune system that removes debris and pathogens that have reached the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z ACE2 is expressed throughout the body on the lining of the arteries and veins that course through all organs, but it is particularly dense on the cells lining the alveoli and small intestines. Profile of a killer: the complex biology powering the coronavirus pandemic 2020-05-03T04:00:00Z In emphysema, which mostly arises from smoking tobacco, the walls of the alveoli are destroyed, decreasing the surface area for gas exchange. Biology for AP Courses 2022-06-09T00:00:00Z In this complex organ, the vast majority of macrophages live in tiny air sacs called alveoli. Could Newly Found “Peacekeeping” Cells Be a Weapon against COVID-19? 2020-03-27T04:00:00Z Normally, oxygen crosses the alveoli into the capillaries, tiny blood vessels that lie beside the air sacs; the oxygen is then carried to the rest of the body. How does coronavirus kill? Clinicians trace a ferocious rampage through the body, from brain to toes 2020-04-17T04:00:00Z The respiratory membrane allows gases to cross by simple diffusion, allowing oxygen to be picked up by the blood for transport and CO2 to be released into the air of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z Lungs contain grapelike clusters of tiny air sacs called alveoli. COVID-19 lung patterns show few clues for treating pneumonia 2020-03-22T04:00:00Z The respiratory bronchioles open into the alveolar ducts, alveolar sacs, and alveoli. Biology for AP Courses 2022-06-09T00:00:00Z That affects the lungs’ response to a virus in the alveoli, the tiny air sacs where oxygen moves into the bloodstream. Does air pollution make you more susceptible to coronavirus? California won't like the answer 2020-03-21T04:00:00Z Autopsies show their alveoli became stuffed with fluid, white blood cells, mucus, and the detritus of destroyed lung cells. How does coronavirus kill? Clinicians trace a ferocious rampage through the body, from brain to toes 2020-04-17T04:00:00Z The pulmonary artery is an artery that arises from the pulmonary trunk and carries deoxygenated, arterial blood to the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z The study focused on the major airways rather than the small structures called alveoli, where oxygen crosses from the air we breathe into our lungs. Lungs 'magically' heal damage from smoking 2020-01-29T05:00:00Z Because there are so many alveoli and alveolar sacs in the lung, the surface area for gas exchange is very large. Biology for AP Courses 2022-06-09T00:00:00Z They focused on structures in the lung called alveoli, which are the ‘air sacs’ of this organ. Pressure regulates immune-cell function 2019-08-20T04:00:00Z So oxygen uptake is impeded by constricted blood vessels, rather than by clogged alveoli. How does coronavirus kill? Clinicians trace a ferocious rampage through the body, from brain to toes 2020-04-17T04:00:00Z The capillaries branch and follow the bronchioles and structure of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z Tiny, noxious molecules land on your lungs’ alveoli and then pass into your bloodstream. Review | The air we breathe may be slowly killing us 2019-05-16T04:00:00Z Surfactant, a mixture of phospholipids and lipoproteins, acts like a detergent in the airways to reduce surface tension and allow for opening of the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z Another pathway to harm is opened up when the smallest particles find their way into the depths of the lungs, to the alveoli, from where oxygen is transferred into the bloodstream. What does air pollution do to our bodies? 2019-04-02T04:00:00Z The virus may directly attack the lining of the heart and blood vessels, which, like the nose and alveoli, are rich in ACE2 receptors. How does coronavirus kill? Clinicians trace a ferocious rampage through the body, from brain to toes 2020-04-17T04:00:00Z The composition of air in the atmosphere and in the alveoli differs. Anatomy and Physiology 2013-06-19T00:00:00Z Usually caused by viruses or bacteria, and sometimes by fungi or parasites, pneumonia is an infection of the air sacs called alveoli in your lungs. Cough, fever and chills could mean you have pneumonia 2019-01-04T05:00:00Z It could be caused by the alveoli capillaries are not receiving blood flow. Biology for AP Courses 2022-06-09T00:00:00Z Turner suspected that the termites themselves circulated air as they moved, like mobile alveoli. A giant crawling brain: the jaw-dropping world of termites 2018-09-18T04:00:00Z Mr. Kavanagh says the herbal extracts, when inhaled, will travel to the lungs and enter the bloodstream through the alveoli. Can Breathing Oils and Herbs Aid Calm and Well-Being? 2016-09-26T04:00:00Z Recall that the respiratory system works to humidify incoming air, thereby causing the air present in the alveoli to have a greater amount of water vapor than atmospheric air. Anatomy and Physiology 2013-06-19T00:00:00Z Since the function of the sigh was to reinflate collapsed alveoli with twice the normal intake of air, sighing becomes part of the survival machinery. A sigh's not just a sigh - it's a fundamental life-sustaining reflex 2016-02-08T05:00:00Z If you were travelling in a miniaturized ship through the respiratory system, from the pharynx to an alveolus, which structures would you pass along the way, and in what order? Biology for AP Courses 2022-06-09T00:00:00Z The channels are separated by a porous membrane which is lined on the top with epithelial cells derived from human lung alveoli, and on the bottom with endothelial cells from blood vessels. Towards a body-on-a-chip 2015-06-11T04:00:00Z To mimic the conditions of the lung within a microfluidic device, Ingber's team cultivated epithelial cells derived from human alveoli and endothelial cells derived from blood vessels on either side of a porous polymer membrane. Artificial organs: Honey, I shrunk the lungs : Nature : Nature Publishing Group 2015-03-24T04:00:00Z In contrast, when ventilation is insufficient, the partial pressure of oxygen in the alveoli drops. Anatomy and Physiology 2013-06-19T00:00:00Z If measles gets a foothold in the lungs, it becomes life-threatening, filling the multitudinous, tiny air sacs called alveoli with fluid and pus. Measles Is Anything But Benign, Doctor 2015-02-13T05:00:00Z Figure 30.10 shows a human alveolus, which is part of the respiratory system. Biology for AP Courses 2022-06-09T00:00:00Z I placed a stethoscope on his back and heard the whooshing of air into alveoli on the left, but over his right flank I heard silence. Of Medicine and Mushrooms 2014-10-04T04:00:00Z On the largest scales, the universe developed into a fibrous cosmic web-like structure not unlike the patterns seen in the alveoli of a human lung. Life In An Alternate Universe 2013-11-29T23:25:00Z In cases when ventilation is not sufficient for an alveolus, the body redirects blood flow to alveoli that are receiving sufficient ventilation. Anatomy and Physiology 2013-06-19T00:00:00Z In the emphysema form of COPD, holes appear in the alveoli — the tiny, balloon-like structures in the lungs where oxygen and carbon dioxide are exchanged. Nutrition: The vitamin D complex 2012-09-26T17:22:40.297Z The graph plots percent oxygen saturation of hemoglobin as a function of oxygen partial pressure in the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z Emphysema eats away at the lung's air sacs, or alveoli, so that less surface area is available for gas exchange. Health impact: Breathless 2012-09-26T17:22:23.033Z The children developed "in the last hours of their life a total destruction of the alveolus in the lungs." Virus found as mystery-disease probe advances in Cambodia 2012-07-09T02:55:04Z At the same time, the pulmonary arterioles that serve alveoli receiving sufficient ventilation vasodilate, which brings in greater blood flow. Anatomy and Physiology 2013-06-19T00:00:00Z Its alveoli in one maxilla are closed and those in the opposite maxilla are more open than is normal. The Recent Mammals of Tamaulipas, Mexico 2012-04-06T02:00:23.953Z The diagram shows a red blood cell in an alveolus and then in a body tissue. Biology for AP Courses 2022-06-09T00:00:00Z Of, pertaining to, or resembling, alveoli or little cells, sacs, or sockets. ÷ processes, the processes of the maxillary bones, containing the sockets of the teeth. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z It may happen occasionally that in the violent inspiratory efforts at the close of the paroxysms irritating secretions may be sucked from the bronchioles into the alveoli, and there excite inflammation. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z Carbon dioxide is released in the opposite direction of oxygen, from the blood to the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z It was in the waste of the dental alveoli and of the fangs of shedding teeth that in 1754-1755, as he tells us, he received his first hint of the use of the absorbents. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 8 "Hudson River" to "Hurstmonceaux" 2012-02-24T03:00:27.173Z At the end of each duct are approximately 100 alveolar sacs, each containing 20 to 30 alveoli that are 200 to 300 microns in diameter. Biology for AP Courses 2022-06-09T00:00:00Z Having the form of alveoli, or little sockets, cells, or cavities. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z The structure of cancer suggested an organ, as it consisted of collections of cells resembling epithelium, within spaces or alveoli whose walls were formed of connective tissue. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z Although the solubility of oxygen in blood is not high, there is a drastic difference in the partial pressure of oxygen in the alveoli versus in the blood of the pulmonary capillaries. Anatomy and Physiology 2013-06-19T00:00:00Z The superior border is hollowed out by alveoli. Artistic Anatomy of Animals 2011-12-17T03:00:16.893Z The anatomical arrangement of capillaries and alveoli emphasizes the structural and functional relationship of the respiratory and circulatory systems. Biology for AP Courses 2022-06-09T00:00:00Z H to H' Alveolar length of maxillary tooth-row.—From anterior border of alveolus of M1 to posterior alveolus of M3. Speciation and Evolution of the Pygmy Mice, Genus Baiomys 2011-12-15T03:00:11.933Z Cranial measurements were taken as follows: Basilar length.—From the anteriormost inferior border of the foramen magnum to a line connecting the posteriormost margins of the alveoli of the first upper incisors. Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11] 2011-07-09T02:00:11.847Z This large difference in partial pressure creates a very strong pressure gradient that causes oxygen to rapidly cross the respiratory membrane from the alveoli into the blood. Anatomy and Physiology 2013-06-19T00:00:00Z The inferior border is hollowed out into alveoli, in which are implanted the superior molar and canine teeth. Artistic Anatomy of Animals 2011-12-17T03:00:16.893Z The surface area of alveoli in the lungs is approximately 75 m2. Biology for AP Courses 2022-06-09T00:00:00Z Juveniles.—Nestling mice yet unweaned; sutures in cranium incompletely closed; bony parts of skull fragile; M3 and m3 not erupted or only partly erupted and not protruding above margins of alveoli. Speciation and Evolution of the Pygmy Mice, Genus Baiomys 2011-12-15T03:00:11.933Z In young females the width of the braincase is more than the distance between the alveoli of the incisor and first molar. Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11] 2011-07-09T02:00:11.847Z The partial pressure of carbon dioxide in the blood of the capillary is about 45 mm Hg, whereas its partial pressure in the alveoli is about 40 mm Hg. Anatomy and Physiology 2013-06-19T00:00:00Z Owing to the absence of superior incisors in ruminants, the intermaxillary bone presents no alveoli. Artistic Anatomy of Animals 2011-12-17T03:00:16.893Z Each alveolar sac contains 20 to 30 spherical alveoli and has the appearance of a bunch of grapes. Biology for AP Courses 2022-06-09T00:00:00Z The enzyme shows up frequently on lung capillary cells that maintain air sacs called alveoli, which are central to oxygen exchange, thus tracing the origin of the microparticles. Blood Tests Could Forewarn of Emphysema 2011-03-16T17:07:00Z Skull: Sagittal crest absent in females and barely present in males; least width of braincase more than distance from alveolus of incisor to middle of lateral border of P4 at alveolar border. Subspeciation in Pocket Gophers of Kansas, [KU. Vol. 1 No. 11] 2011-07-09T02:00:11.847Z As oxygen diffuses across the respiratory membrane from the alveolus to the capillary, it also diffuses into the red blood cell and is bound by hemoglobin. Anatomy and Physiology 2013-06-19T00:00:00Z Woman presents very little prominence of the frontal sinuses; the cheek-bones display beautiful curves; the edges of the alveoli containing the teeth are much more elliptical than in man; and the chin is softly rounded. Beauty Illustrated Chiefly by an Analysis and Classificatin of Beauty in Woman 2011-02-28T03:00:32.460Z Air flows into the atrium of the alveolar sac, then circulates into alveoli where gas exchange occurs with the capillaries. Biology for AP Courses 2022-06-09T00:00:00Z It occurs as the covering epithelium of the alveoli of the lung, of the kidney glomerules and capsule, &c. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z In the peripheral alveoli are seen immature germs. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Carbon dioxide diffuses out of the erythrocytes and into the plasma, where it can further diffuse across the respiratory membrane into the alveoli to be exhaled during pulmonary ventilation. Anatomy and Physiology 2013-06-19T00:00:00Z On microscopical examination the gland shows a large number of closed tubular alveoli, lined by columnar epithelial cells, unsupported by a basement membrane, and filled with colloid or jelly-like material. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 "Dubner" to "Dyeing" 2010-12-26T03:00:17.840Z However, the content about the movement of gases across the membranes of alveoli is an important application of the principles of diffusion that we explored in the chapter on passive transport. Biology for AP Courses 2022-06-09T00:00:00Z One of the terminal lobules of the pancreas, showing the spherical form of the alveoli. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z The device, about the size of a pea, mimics the function of air sacs called alveoli, which transfer oxygen through a thin membrane from the lung to the blood. U.S. scientists create artificial lungs, of sorts 2010-06-24T18:45:00Z A lower partial pressure of oxygen means that there is a smaller difference in partial pressures between the alveoli and the blood, so less oxygen crosses the respiratory membrane. Anatomy and Physiology 2013-06-19T00:00:00Z The jaw contains seven molar teeth, one canine, and three incisors; but the end of the jaw is fractured, and traces of the alveolus of a fourth incisor are seen. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology In the lungs, oxygen diffuses out of the alveoli and into the capillaries surrounding the alveoli. Biology for AP Courses 2022-06-09T00:00:00Z On the left the alveoli are unfolded to show their general arrangement. d, Small duct of gland subdividing into branches; e, f and g, terminal tubular alveoli of gland. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z What is meant is a piece of the alveolar process, or portion of bone around the alveolus. Every-Day Errors of Speech The surface tension of the alveoli also influences pressure, as it opposes the expansion of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z It was compared by the Academicians to a great tooth 478 half extracted from the alveolus, with the upper part of the fangs exposed. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Because this pressure gradient exists, oxygen diffuses down its pressure gradient, moving out of the alveoli and entering the blood of the capillaries where O2 binds to hemoglobin. Biology for AP Courses 2022-06-09T00:00:00Z Thus in a typical acinous gland the cells are restricted to the final alveoli. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z "B" is a right ramus bearing m2 and the roots of m3 and is broken off at the middle of the alveolus of m1. Pleistocene Soricidae from San Josecito Cave, Nuevo Leon, Mexico Anatomical dead space refers to the air within the respiratory structures that never participates in gas exchange, because it does not reach functional alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z Alveolatus is from alveolus, a small hollow, referring to the pitted form of the pore-surface, which is one of the characters of this species. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth The stallion has canine teeth, but the mare has only traces of the alveoli, which, as I am informed by the eminent veterinary Mr. G. T. The Variation of Animals and Plants Under Domestication, Volume II (of 2) They really originate in the periosteum of the alveolus or in the periodontal membrane, and are essentially of the nature of fibro-sarcoma. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The alveoli of all the other teeth are present and in a good state of preservation. On The Affinities of Leptarctus primus of Leidy American Museum of Natural History, Vol. VI, Article VIII, pp. 229-331. The partial pressure of oxygen is high in the alveoli and low in the blood of the pulmonary capillaries. Anatomy and Physiology 2013-06-19T00:00:00Z The pores or alveoli are angular elongated, white at first, then straw-color. The Mushroom, Edible and Otherwise Its Habitat and its Time of Growth Receptacle expanded above the andrœcium, in the form of an inverted cone, containing a large number of alveoli with circular openings. The Medicinal Plants of the Philippines As it increases in size it spreads over the alveoli of several teeth, becomes softer, and assumes a dark violet colour, and if subjected to pressure or irritation may ulcerate and bleed. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The individual strands of this meshwork are more than two times as large at advanced age as at birth, consequently the alveoli of the meshwork becomes markedly reduced in size. Glaucoma A Symposium Presented at a Meeting of the Chicago Ophthalmological Society, November 17, 1913 Therefore, carbon dioxide diffuses across the respiratory membrane from the blood into the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z When the base of the teeth, or the alveolus, was struck, a wedge was often broken away, and from the apex of the resulting gap a fracture extended to the lower margin of the bone. Surgical Experiences in South Africa, 1899-1900 Being Mainly a Clinical Study of the Nature and Effects of Injuries Produced by Bullets of Small Calibre The two large sacs are infundibula; the small divisions are alveoli. Physiology and Hygiene for Secondary Schools A dental plate should be fitted to fill up the gap in the alveolus. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The cells are small and closely packed together in alveoli or in reticulated columns; cell nests are rare. Manual of Surgery Volume First: General Surgery. Sixth Edition. External respiration refers to gas exchange that occurs in the alveoli, whereas internal respiration refers to gas exchange that occurs in the tissue. Anatomy and Physiology 2013-06-19T00:00:00Z And though on the separation of the cotyledons of ruminating animals no blood is effused, yet this is owing clearly to the greater power of contraction of their uterine lacun� or alveoli. Zoonomia, Vol. I Or, the Laws of Organic Life By this arrangement the air within the alveoli is brought very near a large surface of blood, and the exchange of gases between the air and the blood is made possible. Physiology and Hygiene for Secondary Schools The teeth become loose, project from the alveoli, and sometimes fall out. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. If the alveoli are large and the intervening stroma is scanty and delicate, the tumour is soft and brain-like, and is described as a medullary or encephaloid cancer. Manual of Surgery Volume First: General Surgery. Sixth Edition. Once milk is made in the alveoli, stimulated myoepithelial cells that surround the alveoli contract to push the milk to the lactiferous sinuses. Anatomy and Physiology 2013-06-19T00:00:00Z In both the above specimens the permanent false molar is concealed in its alveolus, and was discovered by removing part of the substance of the jaw, indicating the nonage of the individuals. Three Expeditions into the Interior of Eastern Australia, Volume 2 The small pits are alveoli, and the vessels in their walls are chiefly capillaries. Physiology and Hygiene for Secondary Schools Limited portions of the alveolus are frequently broken in the extraction of teeth. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The cells composing the columns and filling the alveoli vary with the character of the epithelium in which the cancer originates. Manual of Surgery Volume First: General Surgery. Sixth Edition. The pulmonary capillaries surround lung structures known as alveoli that are the sites of oxygen and carbon dioxide exchange. Anatomy and Physiology 2013-06-19T00:00:00Z A vital substance that coats the lining of the baby's lungs and its small interior cavities, called alveoli, is not fully advanced at this stage of development. Undo, a Novel By Joe Hutsko This starts at the right ventricle and by its branches conveys blood to the capillaries surrounding the alveoli in all parts of the lungs. Physiology and Hygiene for Secondary Schools The margins of the cleft in the lip are also attached to the alveolus by firm reflections of the mucous membrane. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The lympho-sarcoma presents a structure similar to that of lymph-follicular tissue, and the alveolar sarcoma an arrangement of cells in alveoli resembling that seen in cancers. Manual of Surgery Volume First: General Surgery. Sixth Edition. Pulmonary ventilation provides air to the alveoli for this gas exchange process. Anatomy and Physiology 2013-06-19T00:00:00Z The pressure of the secretion in the alveoli causes the cells to cease to secrete, much in the same way that pressure in the ureters injures the secretory action of the renal epithelium. Hormones and Heredity Finding its way into the smallest divisions of the lungs, called the alveoli, the air comes very near a large surface of blood. Physiology and Hygiene for Secondary Schools The inflammation begins close to the alveolus, and may spread back along the palate. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. These columns are enclosed in spaces—termed alveoli—which are probably dilated lymph spaces, and which communicate freely with the lymph vessels. Manual of Surgery Volume First: General Surgery. Sixth Edition. When ventilation is sufficient, oxygen enters the alveoli at a high rate, and the partial pressure of oxygen in the alveoli remains high. Anatomy and Physiology 2013-06-19T00:00:00Z In another specimen, twenty-one days after heat, the milk glands were still more advanced, with distended alveoli and enlarged ducts. Hormones and Heredity Separated from the blood at the alveoli of the lungs and then forced through the air passages into the atmosphere. Physiology and Hygiene for Secondary Schools A muco-purulent discharge escapes from within the free edge of the gum and alveolus. Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. The epithelial cells are not arranged on any definite plan, but are closely packed in irregularly shaped alveoli. Manual of Surgery Volume First: General Surgery. Sixth Edition. Without the large difference in partial pressure between the alveoli and the blood, oxygen does not diffuse efficiently across the respiratory membrane. Anatomy and Physiology 2013-06-19T00:00:00Z Pertaining to the alveoli, the cavities for the reception of the teeth. A Practical Physiology The interior of the infundibulum is separated into many small spaces, known as the alveoli, or air cells. Physiology and Hygiene for Secondary Schools The stallion has canine teeth, but the mare has only traces of the alveoli, which, as I am informed by the eminent veterinarian Mr. G.T. The Variation of Animals and Plants under Domestication — Volume 2 It may also help the alveoli to form and mature. Anatomy and Physiology 2013-06-19T00:00:00Z This is achieved by constricting the pulmonary arterioles that serves the dysfunctional alveolus, which redirects blood to other alveoli that have sufficient ventilation. Anatomy and Physiology 2013-06-19T00:00:00Z Pulmonary surfactant is critical for inflation to occur, as it reduces the surface tension of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z It is at the alveoli that the oxygen passes from the air into the blood, and the carbon dioxide passes from the blood into the air. Physiology and Hygiene for Secondary Schools The respiratory zone includes the structures of the lung that are directly involved in gas exchange: the terminal bronchioles and alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z As the bronchioles become smaller and smaller, and nearer the alveoli, the epithelium thins and is simple squamous epithelium in the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z The diameter of the bronchioles is sensitive to the partial pressure of carbon dioxide in the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z The pulmonary artery provides deoxygenated blood to the capillaries that form respiratory membranes with the alveoli, and the pulmonary veins return newly oxygenated blood to the heart for further transport throughout the body. Anatomy and Physiology 2013-06-19T00:00:00Z Their exchanges must in all cases take place through the capillary walls and the layer of cells lining the alveoli. Physiology and Hygiene for Secondary Schools As noted earlier, there is surface tension within the alveoli caused by water present in the lining of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z This surface tension tends to inhibit expansion of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z As mentioned above, a greater partial pressure of oxygen in the alveoli causes the pulmonary arterioles to dilate, increasing blood flow. Anatomy and Physiology 2013-06-19T00:00:00Z The residual volume makes breathing easier by preventing the alveoli from collapsing. Anatomy and Physiology 2013-06-19T00:00:00Z By the action of currents and eddies and by the rapid diffusion of gas particles, the air from the outside mixes with that in the alveoli and comes in contact with the membranous walls. Physiology and Hygiene for Secondary Schools An alveolar sac is a cluster of many individual alveoli that are responsible for gas exchange. Anatomy and Physiology 2013-06-19T00:00:00Z An alveolus is approximately 200 μm in diameter with elastic walls that allow the alveolus to stretch during air intake, which greatly increases the surface area available for gas exchange. Anatomy and Physiology 2013-06-19T00:00:00Z External respiration is the exchange of gases with the external environment, and occurs in the alveoli of the lungs. Anatomy and Physiology 2013-06-19T00:00:00Z Taken together, the alveoli and capillary membranes form a respiratory membrane that is approximately 0.5 mm thick. Anatomy and Physiology 2013-06-19T00:00:00Z The carbon dioxide, on the other hand, being in excess in the blood, diffuses toward the air in the alveoli. Physiology and Hygiene for Secondary Schools As they near the alveoli, the pulmonary arteries become the pulmonary capillary network. Anatomy and Physiology 2013-06-19T00:00:00Z Once the blood is oxygenated, it drains from the alveoli by way of multiple pulmonary veins, which exit the lungs through the hilum. Anatomy and Physiology 2013-06-19T00:00:00Z By week 28, enough alveoli have matured that a baby born prematurely at this time can usually breathe on its own. Anatomy and Physiology 2013-06-19T00:00:00Z External respiration occurs as a function of partial pressure differences in oxygen and carbon dioxide between the alveoli and the blood in the pulmonary capillaries. Anatomy and Physiology 2013-06-19T00:00:00Z Trace air from the outside atmosphere into the alveoli. Physiology and Hygiene for Secondary Schools Figure 22.22 External Respiration In external respiration, oxygen diffuses across the respiratory membrane from the alveolus to the capillary, whereas carbon dioxide diffuses out of the capillary into the alveolus. Anatomy and Physiology 2013-06-19T00:00:00Z This difference is about 64 mm Hg: The partial pressure of oxygen in the alveoli is about 104 mm Hg, whereas its partial pressure in the blood of the capillary is about 40 mm Hg. Anatomy and Physiology 2013-06-19T00:00:00Z The respiratory system, however, is not fully developed until early childhood, when a full complement of mature alveoli is present. Anatomy and Physiology 2013-06-19T00:00:00Z However, pulmonary surfactant helps to reduce the surface tension so that the alveoli do not collapse during expiration. Anatomy and Physiology 2013-06-19T00:00:00Z Trace the blood from the right ventricle to the alveoli and back again to the left auricle. Physiology and Hygiene for Secondary Schools As a result, oxygen diffuses across the respiratory membrane from the alveoli into the blood. Anatomy and Physiology 2013-06-19T00:00:00Z In contrast, the partial pressure of carbon dioxide is high in the pulmonary capillaries and low in the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z However, alveoli continue to develop and mature into childhood. Anatomy and Physiology 2013-06-19T00:00:00Z Ventilation is the process that moves air into and out of the alveoli, and perfusion affects the flow of blood in the capillaries. Anatomy and Physiology 2013-06-19T00:00:00Z Both are important in gas exchange, as ventilation must be sufficient to create a high partial pressure of oxygen in the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z If ventilation is insufficient and the partial pressure of oxygen drops in the alveolar air, the capillary is constricted and blood flow is redirected to alveoli with sufficient ventilation. Anatomy and Physiology 2013-06-19T00:00:00Z As the fetus grows, the respiratory system continues to expand as more alveoli develop and more surfactant is produced. Anatomy and Physiology 2013-06-19T00:00:00Z A full complement of functional alveoli does not appear until around 8 years of age. Anatomy and Physiology 2013-06-19T00:00:00Z Beginning at about week 36 and lasting into childhood, alveolar precursors mature to become fully functional alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z It reduces the surface tension of the alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z These vessels branch to supply blood to the pulmonary capillaries, where gas exchange occurs within the lung alveoli. Anatomy and Physiology 2013-06-19T00:00:00Z |
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