| 单词 | depolarization |
| 例句 | This opening allows sodium ions to enter the neuron and results in depolarization of the membrane—a decrease in the voltage across the neuron membrane. Concepts of Biology 2013-04-25T00:00:00Z The depolarization causes the membrane to again become impermeable to Na+ , and the movement of K+ quickly returns the cell to its resting potential, or repolarizes it. College Physics for AP Courses 2015-08-12T00:00:00Z In depolarization, the inside of the membrane becomes more positive than the outside as Na+ flows to the inside. Biology for AP Courses 2022-06-09T00:00:00Z Single-unit smooth muscle tissue contains gap junctions to synchronize membrane depolarization and contractions so that the muscle contracts as a single unit. Anatomy and Physiology 2013-06-19T00:00:00Z Second, there's the depolarization variety , which seeks to dismantle the cleavages that result from an oversimplified politics of "us versus them," and actively seeks to create social and political action amenable to pluralist democracy. Putin's war and the battle for democracy: How this conflict raises the global stakes 2022-04-03T04:00:00Z The depolarization of the membrane proceeds in a wave down the length of the axon. Concepts of Biology 2013-04-25T00:00:00Z Thus, a depolarization wave can be sent across the heart, coordinating its rhythmic contractions and enabling it to perform its vital function of propelling blood through the circulatory system. College Physics for AP Courses 2015-08-12T00:00:00Z The cell would not undergo depolarization and hyperpolarization, which are necessary to fire an action potential and then return the cell to the resting state. Biology for AP Courses 2022-06-09T00:00:00Z A third type of channel that is an important part of depolarization in the action potential is the voltage-gated Na+ channel. Anatomy and Physiology 2013-06-19T00:00:00Z The dreams of racial justice, or of depolarization, or even of restored belief in a single, shared reality, have been deferred. Opinion | The Webb Space Telescope launch was a fitting end to 2021 2022-01-01T05:00:00Z My fourth general concern is that people too quickly equate depolarization efforts with compromise. Why is online political culture so distorted and awful? Sociologist explains why — and how to fix it 2021-04-10T04:00:00Z This wave of depolarization is spreading from the top of the heart and is represented by a vector pointing in the direction of the wave. College Physics for AP Courses 2015-08-12T00:00:00Z At excitatory synapses, this opening allows positive ions to enter the neuron and results in depolarization of the membrane—a decrease in the difference in voltage between the inside and outside of the neuron. Biology for AP Courses 2022-06-09T00:00:00Z Any depolarization that does not change the membrane potential to -55 mV or higher will not reach threshold and thus will not result in an action potential. Anatomy and Physiology 2013-06-19T00:00:00Z This is consistent with other work that shows how connecting with people we disagree with on an emotional level is key for depolarization and persuasion. How did mask wearing become so politicized? 2020-09-14T04:00:00Z Receptor activation causes ion movement across the cell membrane, which produces depolarization — an increase in positive charge inside the postsynaptic neuron that leads to excitation. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z The ECG measures components of depolarization and repolarization of the heart muscle and can yield significant information on the functioning and malfunctioning of the heart. College Physics for AP Courses 2015-08-12T00:00:00Z Once depolarization is complete, the cell must now "reset" its membrane voltage back to the resting potential. Biology for AP Courses 2022-06-09T00:00:00Z A stimulus will start the depolarization of the membrane, and voltage-gated channels will result in further depolarization followed by repolarization of the membrane. Anatomy and Physiology 2013-06-19T00:00:00Z Electric charges that accumulate on the surfaces of these materials produce an internal electric field called a depolarization field that, if not mitigated by external electrodes, is often large enough to suppress the polarization completely. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z Both groups also engineered human glioma cells to express a light-activatable version of an ion channel that produces cellular depolarization, similar to that obtained by the synaptic-mediated activation of glutamate receptors. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z Since the shape of the heart and the path of the depolarization wave are not simple, the QRS complex has this typical shape and time span. College Physics for AP Courses 2015-08-12T00:00:00Z The cell would not undergo depolarization, which is necessary to fire an action potential and then return the cell to the resting state. Biology for AP Courses 2022-06-09T00:00:00Z The action potential travels down the axon as voltage-gated ion channels are opened by the spreading depolarization. Anatomy and Physiology 2013-06-19T00:00:00Z However, this arrangement of atoms produces charges on the material’s surface, and these charges generate a depolarization field that opposes the polarization. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z The depolarization of glioma cells induced by neuronal activity caused a transient rise of calcium ions in the cytoplasm, which then spread through the network of glioma cells through their gap junctions. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z The QRS complex is created by the depolarization and contraction of the ventricles and is followed shortly by the maximum or systolic blood pressure. College Physics for AP Courses 2015-08-12T00:00:00Z The cell would not undergo depolarization, repolarization, and hyperpolarization, which are necessary to fire an action potential and then return the cell to the resting state. Biology for AP Courses 2022-06-09T00:00:00Z Imbalances in Na+ and K+ levels as a result of membrane depolarization may disrupt Ca++ flow out of the SR. Anatomy and Physiology 2013-06-19T00:00:00Z In thin-film ferroelectrics, if the polarization is perpendicular to the plane of the film — the preferable direction for applications — the depolarization field is usually strong enough to suppress the polarization completely. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z In neurons, synaptic activity enables the depolarization and calcium-ion influx that is necessary for cellular differentiation, proliferation and survival. Dangerous liaisons as tumour cells form synapses with neurons 2019-09-17T04:00:00Z The major features are labeled P, Q, R, S, and T. The P wave is generated by the depolarization and contraction of the atria as they pump blood into the ventricles. College Physics for AP Courses 2015-08-12T00:00:00Z This reduces the voltage difference between the inside and outside of the cell, which is called depolarization. Biology for AP Courses 2022-06-09T00:00:00Z Going down the length of the axon, the action potential is propagated because more voltage-gated Na+ channels are opened as the depolarization spreads. Anatomy and Physiology 2013-06-19T00:00:00Z Such charges produce an electric field known as a depolarization field that usually suppresses the polarization, limiting applications for these materials. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z It’s also still unclear how seizures might cause spreading depolarization in the brain stem, and how to identify those at highest risk. Sudden death in epilepsy: Researchers finger possible cause 2015-04-08T04:00:00Z The QRS complex is created by the depolarization of the ventricles as they pump blood to the lungs and body. College Physics for AP Courses 2015-08-12T00:00:00Z As ACh binds at the motor end plate, this depolarization is called an end-plate potential. Biology for AP Courses 2022-06-09T00:00:00Z Because voltage-gated Na+ channels are inactivated at the peak of the depolarization, they cannot be opened again for a brief time—the absolute refractory period. Anatomy and Physiology 2013-06-19T00:00:00Z It is, however, the first observation of an out-of-plane polarization in an atomically thin chalcogenide film that is stable without electrodes mitigating the depolarization field. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z They also found that the mutant animal tissue responded more readily to their efforts to induce spreading depolarization after death, by changing the chemical solution in which the samples were bathed. Sudden death in epilepsy: Researchers finger possible cause 2015-04-08T04:00:00Z The mechanism for detection of external electric fields is similar to that for producing nerve signals in the cell through depolarization and repolarization—the movement of ions across the cell membrane. College Physics for AP Courses 2015-08-12T00:00:00Z The depolarization then spreads along the sarcolemma, creating an action potential as sodium channels adjacent to the initial depolarization site sense the change in voltage and open. Biology for AP Courses 2022-06-09T00:00:00Z Because of this, depolarization spreading back toward previously opened channels has no effect. Anatomy and Physiology 2013-06-19T00:00:00Z As a result, hyperferroelectrics are more resistant to the depolarization field than are their oxide counterparts. Stable and switchable electric polarization in two dimensions 2018-07-29T04:00:00Z For example, depolarization seems to cause the perceptual “aura” described by migraine sufferers. Sudden death in epilepsy: Researchers finger possible cause 2015-04-08T04:00:00Z Imaging of brain slices revealed immediate early induction of β-actin transcription after depolarization. [Report] Visualization of Dynamics of Single Endogenous mRNA Labeled in Live Mouse 2014-01-23T19:26:31.396Z The action potential moves across the entire cell, creating a wave of depolarization. Biology for AP Courses 2022-06-09T00:00:00Z Just as with sodium ions in salty flavors, these hydrogen ions enter the cell and trigger depolarization. Anatomy and Physiology 2013-06-19T00:00:00Z When they applied caffeine and recorded from the Kenyon cells, they saw that caffeine acted at adenosine receptors to cause a small depolarization of the Kenyon cells, making them more likely to fire. Plants give bees a caffeine buzz 2013-03-11T13:45:00.377Z Complete depolarization is usually obtained also in single fluid cells, having in addition a depolarizing solid body, such as oxide of manganese, oxide of copper, or peroxide of lead, in contact with the carbon pole. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z But the sense by accommodation, as it is called by writers on hermeneutics, does not take liberties with the Sacred Text itself in the manner suggested by the advocates of depolarization. Chapters of Bible Study A Popular Introduction to the Study of the Sacred Scriptures 2011-03-27T02:00:12.580Z After depolarization, the membrane returns to its resting state. Biology for AP Courses 2022-06-09T00:00:00Z A G protein signal transduction system ultimately leads to depolarization of the gustatory cell. Anatomy and Physiology 2013-06-19T00:00:00Z When the 206 circuit is struck by electric waves there is an increase in the currents due to the depolarization of the circuit. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The geologists who affirm p. 236that the deluge took place by sinking, and not by a depolarization of the earth, might probably find in these mountains good arguments in favour of their system. Travels in Tartary, Thibet, and China During the years 1844-5-6. Volume 1 [of 2] To my clairvoyant vision, as I now at this moment look at you, every minute atom of your physical organism is in the subtle process of depolarization from unity toward chaos and disintegration. Within the Temple of Isis The doubts thus thrown upon the question were removed by the experiments of Forbes, who first established the polarization and 'depolarization' of heat. Six Lectures on Light Delivered In The United States In 1872-1873 Because there is not constant opening of these channels along the axon segment, the depolarization spreads at an optimal speed. Anatomy and Physiology 2013-06-19T00:00:00Z "It comes to this," said Esther when Chopin spoke louder, "our prayer-book needs depolarization, as Wendell Holmes says of the Bible." Children of the Ghetto A Study of a Peculiar People However, when acetylcholine binds to the muscarinic receptor, of which there are several variants, it might cause depolarization or hyperpolarization of the target cell. Anatomy and Physiology 2013-06-19T00:00:00Z Glutamate is considered an excitatory amino acid, but only because Glu receptors in the adult cause depolarization of the postsynaptic cell. Anatomy and Physiology 2013-06-19T00:00:00Z This effect has been called, naturally but improperly, depolarization. Six Lectures on Light Delivered In The United States In 1872-1873 Much as water runs faster in a wide river than in a narrow creek, Na+-based depolarization spreads faster down a wide axon than down a narrow one. Anatomy and Physiology 2013-06-19T00:00:00Z This is known as depolarization, meaning the membrane potential moves toward zero. Anatomy and Physiology 2013-06-19T00:00:00Z Timed with the peak of depolarization, the inactivation gate closes. Anatomy and Physiology 2013-06-19T00:00:00Z The exact position of the head is interpreted by the brain based on the pattern of hair-cell depolarization. Anatomy and Physiology 2013-06-19T00:00:00Z The postganglionic parasympathetic fibers also release ACh, but the receptors on their targets are muscarinic receptors, which are G protein–coupled receptors and do not exclusively cause depolarization of the postsynaptic membrane. Anatomy and Physiology 2013-06-19T00:00:00Z A stimulus starts the depolarization, but the action potential runs on its own once a threshold has been reached. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 19.20 Action Potential at the SA Node The prepotential is due to a slow influx of sodium ions until the threshold is reached followed by a rapid depolarization and repolarization. Anatomy and Physiology 2013-06-19T00:00:00Z In this case, there is a rapid depolarization, followed by a plateau phase and then repolarization. Anatomy and Physiology 2013-06-19T00:00:00Z The rapid depolarization period typically lasts 3–5 ms. Anatomy and Physiology 2013-06-19T00:00:00Z The small P wave represents the depolarization of the atria. Anatomy and Physiology 2013-06-19T00:00:00Z Another feature of cardiac muscle is its relatively long action potentials in its fibers, having a sustained depolarization “plateau.” Anatomy and Physiology 2013-06-19T00:00:00Z The large QRS complex represents the depolarization of the ventricles, which requires a much stronger electrical signal because of the larger size of the ventricular cardiac muscle. Anatomy and Physiology 2013-06-19T00:00:00Z The rate of depolarization is increased by this additional influx of positively charged ions, so the threshold is reached more quickly and the period of repolarization is shortened. Anatomy and Physiology 2013-06-19T00:00:00Z The QT interval represents the time from the start of depolarization to repolarization of the ventricles, and includes the period of ventricular systole. Anatomy and Physiology 2013-06-19T00:00:00Z The relationship between electrolytes and HR is complex, but maintaining electrolyte balance is critical to the normal wave of depolarization. Anatomy and Physiology 2013-06-19T00:00:00Z There is a high density of voltage-gated Na+ channels so that rapid depolarization can take place here. Anatomy and Physiology 2013-06-19T00:00:00Z It helps establish the resting membrane potential in neurons and muscle fibers after membrane depolarization and action potentials. Anatomy and Physiology 2013-06-19T00:00:00Z The atria begin to contract following depolarization of the atria and pump blood into the ventricles. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 19.33 Effects of Parasympathetic and Sympathetic Stimulation on Normal Sinus Rhythm The wave of depolarization in a normal sinus rhythm shows a stable resting HR. Anatomy and Physiology 2013-06-19T00:00:00Z The entry of Na+ into these cells results in the depolarization of the cell membrane and the generation of a receptor potential. Anatomy and Physiology 2013-06-19T00:00:00Z As that depolarization spreads, new voltage-gated Na+ channels open and more ions rush into the cell, spreading the depolarization a little farther. Anatomy and Physiology 2013-06-19T00:00:00Z The prepotential accounts for the membrane reaching threshold and initiates the spontaneous depolarization and contraction of the cell. Anatomy and Physiology 2013-06-19T00:00:00Z Recognizable points on the ECG include the P wave that corresponds to atrial depolarization, the QRS complex that corresponds to ventricular depolarization, and the T wave that corresponds to ventricular repolarization. Anatomy and Physiology 2013-06-19T00:00:00Z The SA node has the highest inherent rate of depolarization and is known as the pacemaker of the heart. Anatomy and Physiology 2013-06-19T00:00:00Z The electrical event, the wave of depolarization, is the trigger for muscular contraction. Anatomy and Physiology 2013-06-19T00:00:00Z If the node were any farther down the axon, that depolarization would have fallen off too much for voltage-gated Na+ channels to be activated at the next node of Ranvier. Anatomy and Physiology 2013-06-19T00:00:00Z The wave of depolarization begins in the right atrium, and the impulse spreads across the superior portions of both atria and then down through the contractile cells. Anatomy and Physiology 2013-06-19T00:00:00Z The total time elapsed from the initiation of the impulse in the SA node until depolarization of the ventricles is approximately 225 ms. Anatomy and Physiology 2013-06-19T00:00:00Z ACh slows HR by opening chemical- or ligand-gated potassium ion channels to slow the rate of spontaneous depolarization, which extends repolarization and increases the time before the next spontaneous depolarization occurs. Anatomy and Physiology 2013-06-19T00:00:00Z The QRS complex represents depolarization of the ventricles and is followed by ventricular contraction. Anatomy and Physiology 2013-06-19T00:00:00Z At point A, several different excitatory postsynaptic potentials add up to a large depolarization. Anatomy and Physiology 2013-06-19T00:00:00Z NE shortens the repolarization period, thus speeding the rate of depolarization and contraction, which results in an increase in HR. Anatomy and Physiology 2013-06-19T00:00:00Z |
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