Action potential, the brief (about one-thousandth of a second) reversal of electric polarization of the membrane of a nerve cell (neuron) or muscle cell. In the neuron an action potential produces the nerve impulse, and in the muscle cell it produces the
The threshold potential opens voltage-gated sodium channels and causes a large influx of sodium ions. This phase is called the depolarization. During depolarization, the inside of the cell becomes more and more electropositive, until the potential gets closer the electrochemical equilibrium for sodium...
(acetylcholine) from the motor neurone, which activates post-synaptic nicotinic acetylcholine receptors. The nicotinic receptors are ligand-gated cation channels which open in response to acetylcholine, allowing sodium ions to enter the post-synaptic cell and to partially depolarize it. The magnitude of...
和描述的动作电位,钙离子,sodiumions,neurotransmiters和电压依赖性离子通道的作用。 翻译结果2复制译文编辑译文朗读译文返回顶部 ,描述行动的作用潜力,钙离子, sodiumions, neurotransmiters,电压相关的离子渠道。 翻译结果3复制译文编辑译文朗读译文返回顶部
The generation and propagation of the action potential requires an inward flux of sodium ions to depolarize the membrane, followed by an outward potassium flux to repolarize the membrane. Voltage-dependent sodium and potassium channels provide the pathway for the passage of these ions. Keywords: ...
During the depolarization phase of an action potential _ the gates are opened. A. sodium ion B. potassium ion C. chloride ion D. anion E. all of the above During an action potential, the depolarization is largely possible because...
Action potential is based on rapidly reversible changes in the ionic permeability of the cell membrane that are caused by activation and inactivation of ionic membrane canals. In nerve fibers, the ascending phase of action potential is caused by activation of the rapid sodium canals, and the desce...
These features of the action potential allow rapid transfer of information along nerve axons in the nervous system. 展开 关键词: Action potential depolarization membrane potential potassium ions repolarization sodium ions voltage-activated ion channels ...
Restingpotentials,equilibriumpotential,andactionpotentialsMr.Strappssays“Iputthe“rest”inrestingpotential.”TransmembraneproteinsThereare3typesoftransporterswhichappearinthemammalianneuronthatareimportanttothisunit:1.Sodium/potassium(Na+/K+)pump2.Sodiumchannelsandpotassiumchannels3.Voltage-gatedsodiumchannelsand...
An action potential is initiated and propagated by opening channels in the axon membrane to allow positive charge (e.g., sodium ions) to enter the axon. This causes the voltage of the inside of the axon to become positive, i.e., it depolarizes a segment of the axon. Depolarization of ...