| 单词 | vasoconstriction |
| 例句 | One such mechanism is vasoconstriction, which is when the muscles in blood vessel walls narrow to prevent heat loss, says cardiologist Laxmi Mehta of the Ohio State University Wexner Medical Center. Extreme Temperatures Can Threaten Heart Health 2023-11-01T04:00:00Z We agree that the tannins in tea have astringent properties, which means they can cause vasoconstriction and enhance blood clotting. Tea bags help stop bleeding after tooth extraction 2023-10-25T04:00:00Z They also control a response to stress by increasing glucose synthesis from fats and proteins and interact with epinephrine to cause vasoconstriction. Concepts of Biology 2013-04-25T00:00:00Z The blood vessels in my hands are being closed off - known as vasoconstriction - in order to keep my warm blood for my critical organs. Staying warm: What does an unheated room do to your body? 2022-11-18T05:00:00Z The hypothalamus maintains the set point for body temperature through reflexes that cause vasodilation and sweating when the body is too warm, or vasoconstriction and shivering when the body is too cold. Biology for AP Courses 2022-06-09T00:00:00Z Blood volume is important in maintaining sufficient blood pressure, and there are nonrenal mechanisms involved in its preservation, including vasoconstriction, which can act within seconds of a drop in pressure. Anatomy and Physiology 2013-06-19T00:00:00Z This was followed by a more prolonged vasoconstriction. A richer view of aura 2020-10-13T04:00:00Z The hypothalamus maintains the set point for body temperature through reflexes that cause vasodilation or vasoconstriction and shivering or sweating. Concepts of Biology 2013-04-25T00:00:00Z "What is most likely happening here is that hypoxic vasoconstriction is lost for some reason, so that blood does flow to places where there is some damage to the lungs," Moss said. 'Silent hypoxia' may be killing COVID-19 patients, but there's hope 2020-04-28T04:00:00Z What are the roles of vasodilation and vasoconstriction in maintaining body temperature? Biology for AP Courses 2022-06-09T00:00:00Z You saw earlier in the chapter that renin activity leads to an almost immediate rise in blood pressure as activated angiotensin II produces vasoconstriction. Anatomy and Physiology 2013-06-19T00:00:00Z “Colder temperatures increase vasoconstriction in the arteries, which causes them to clamp down,” she explained. Weather data show cold temperatures raise risk of heart attacks, report suggests 2018-10-26T04:00:00Z But in this case, the man who ate the Reaper began suffering “thunderclap” headaches and was diagnosed with RCSV, or reversible cerebral vasoconstriction syndrome. It turns out eating a paralyzingly hot chili pepper can have negative effects on your body - Golf Digest 2018-04-10T04:00:00Z The scientific term for this temporary narrowing of arteries is reversible cerebral vasoconstriction syndrome. Man who ate world’s hottest pepper lands in hospital 2018-04-09T04:00:00Z Vasodilation allows for radiation and evaporative heat loss, and vasoconstriction brings blood to the core to conserve heat by vital organs. Biology for AP Courses 2022-06-09T00:00:00Z Immediate vasoconstriction to increase blood pressure is the result. Anatomy and Physiology 2013-06-19T00:00:00Z The concept of prolonged vasoconstriction due to strangulation by dead pericytes raises several questions that require further investigation. Vascular biology: Brain vessels squeezed to death 2014-04-04T18:23:16.270Z That's the reason people reported exercise as a trigger, but the vasoconstriction is already there. Migraine Triggers May Not Be So Potent After All 2013-01-24T23:20:32Z These results further support an essential role for sarcolemmal nNOSμ in the normal modulation of sympathetic vasoconstriction in exercising human skeletal muscle and implicate the NO-cGMP pathway as a putative new target for treating BMD. [Research Articles] Tadalafil Alleviates Muscle Ischemia in Patients with Becker Muscular Dystrophy 2012-11-28T19:55:10.597Z The movement of materials at the site of capillaries is regulated by vasoconstriction, narrowing of the blood vessels, and vasodilation, widening of the blood vessels; this is important in the overall regulation of blood pressure. Biology for AP Courses 2022-06-09T00:00:00Z At the same time, it triggers vasoconstriction to blood vessels serving less essential organs such as the gastrointestinal tract, kidneys, and skin, and downregulates some components of the immune system. Anatomy and Physiology 2013-06-19T00:00:00Z On the contrary, vasoconstriction causes a rise in diastolic pressure and a fall in pulse pressure. Arteriosclerosis and Hypertension: with Chapters on Blood Pressure, 3rd Edition. 2011-10-11T02:01:07.890Z The circulatory reaction was a peripheral vasoconstriction with diminished fullness of pulse and slight acceleration of cardiac rhythm; there was never any distinct slowing of heart under the influence of music. Studies in the Psychology of Sex, Volume 4 Sexual Selection In Man It will also trigger sympathetic stimulation of the peripheral vessels, resulting in vasoconstriction. Anatomy and Physiology 2013-06-19T00:00:00Z The elastic connective tissue stretches and supports the blood vessels, and the smooth muscle layer helps regulate blood flow by altering vascular resistance through vasoconstriction and vasodilation. Biology for AP Courses 2022-06-09T00:00:00Z The adrenal medulla, in turn, produces a generalized vasoconstriction through the release of epinephrine. Anatomy and Physiology 2013-06-19T00:00:00Z Both vasoconstriction and vasodilation are regulated in part by small vascular nerves, known as nervi vasorum, or “nerves of the vessel,” that run within the walls of blood vessels. Anatomy and Physiology 2013-06-19T00:00:00Z These are generally all sympathetic fibers, although some trigger vasodilation and others induce vasoconstriction, depending upon the nature of the neurotransmitter and receptors located on the target cell. Anatomy and Physiology 2013-06-19T00:00:00Z The diameter of any given vessel may also change frequently throughout the day in response to neural and chemical signals that trigger vasodilation and vasoconstriction. Anatomy and Physiology 2013-06-19T00:00:00Z For example, after a large meal, most of the blood is diverted to the stomach by vasodilation of vessels of the digestive system and vasoconstriction of other vessels. Biology for AP Courses 2022-06-09T00:00:00Z If pressure decreases, fewer action potentials travel to the central nervous system, resulting in more sympathetic stimulation- producing vasoconstriction, which will result in decreased filtration and GFR, and water loss. Anatomy and Physiology 2013-06-19T00:00:00Z This explains why vasodilation and vasoconstriction of arterioles play more significant roles in regulating blood pressure than do the vasodilation and vasoconstriction of other vessels. Anatomy and Physiology 2013-06-19T00:00:00Z Maintaining vascular tone within the veins prevents the veins from merely distending, dampening the flow of blood, and as you will see, vasoconstriction actually enhances the flow. Anatomy and Physiology 2013-06-19T00:00:00Z When blood flow is too high, the smooth muscle will contract in response to the increased stretch, prompting vasoconstriction that reduces blood flow. Anatomy and Physiology 2013-06-19T00:00:00Z During exercise, blood is diverted to the skeletal muscles through vasodilation while blood to the digestive system would be lessened through vasoconstriction. Biology for AP Courses 2022-06-09T00:00:00Z Less dramatic than the vasoconstriction seen in smaller arteries and arterioles, venoconstriction may be likened to a “stiffening” of the vessel wall. Anatomy and Physiology 2013-06-19T00:00:00Z How does vasoconstriction help increase the core temperature of the body? Anatomy and Physiology 2013-06-19T00:00:00Z This includes vasoconstriction of the afferent arterioles, further reducing the volume of blood flowing through the kidneys. Anatomy and Physiology 2013-06-19T00:00:00Z It acts systemically to cause vasoconstriction as well as constriction of both the afferent and efferent arterioles of the glomerulus. Anatomy and Physiology 2013-06-19T00:00:00Z Vasodilation brings blood to the core to conserve heat by vital organs, and vasoconstriction results in radiation and evaporative heat loss. Biology for AP Courses 2022-06-09T00:00:00Z Sympathetic stimulation also triggers the release of epinephrine and norepinephrine, which enhance both cardiac output and vasoconstriction. Anatomy and Physiology 2013-06-19T00:00:00Z As a result, renin has an immediate effect on blood pressure due to angiotensin II–stimulated vasoconstriction and a prolonged effect through Na+ recovery due to aldosterone. Anatomy and Physiology 2013-06-19T00:00:00Z ADH at high levels causes vasoconstriction in addition to its action on the collecting ducts to recover more water. Anatomy and Physiology 2013-06-19T00:00:00Z Specifically in arteries, vasoconstriction decreases blood flow as the smooth muscle in the walls of the tunica media contracts, making the lumen narrower and increasing blood pressure. Anatomy and Physiology 2013-06-19T00:00:00Z Vasodilation results in radiation and evaporative heat loss, and vasoconstriction transfers heat from arteries to veins to warm blood returning to the heart. Biology for AP Courses 2022-06-09T00:00:00Z It increases GFR through concurrent vasodilation of the afferent arteriole and vasoconstriction of the efferent arteriole. Anatomy and Physiology 2013-06-19T00:00:00Z Only one of these factors, the radius, can be changed rapidly by vasoconstriction and vasodilation, thus dramatically impacting resistance and flow. Anatomy and Physiology 2013-06-19T00:00:00Z Blood flow through vessels can be dramatically influenced by vasoconstriction and vasodilation in their walls. Anatomy and Physiology 2013-06-19T00:00:00Z In the arterial system, vasodilation and vasoconstriction of the arterioles is a significant factor in systemic blood pressure: Slight vasodilation greatly decreases resistance and increases flow, whereas slight vasoconstriction greatly increases resistance and decreases flow. Anatomy and Physiology 2013-06-19T00:00:00Z Venoconstriction, while less important than arterial vasoconstriction, works with the skeletal muscle pump, the respiratory pump, and their valves to promote venous return to the heart. Anatomy and Physiology 2013-06-19T00:00:00Z Their thick tunica media allows muscular arteries to play a leading role in vasoconstriction. Anatomy and Physiology 2013-06-19T00:00:00Z |
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