Action potential
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Action potential
An action potential is a transient alteration of the transmembrane voltage across an excitable membrane generated by the activity of voltage-gated ion channels embedded in the membrane. Action potentials play multiple roles...
Action Potentials
The nerve impulse. In the resting neuron, the interior of the axon membrane is negatively charged with respect to the exterior (A). As the action potential passes (B), the polarity is reversed.
action potential
A rapid change in the membrane potential of an excitable cell, caused by stimulus-triggered, selective opening and closing of voltage-sensitive gates in sodium and potassium ion channels.
activation energy ...
action potential A reversal of the electrical potential in the plasma membrane of a neuron that occurs when a nerve cell is stimulated; caused by rapid changes in membrane permeability to sodium and potassium.
Action potential The increase in membrane potential and the changes in sodium and potassium conductances that result from alterations in the permeability of the axon membrane to those ions. Also called nerve impulse.
action potential The sequence of electrical changes occurring when a nerve cell membrane is exposed to a stimulus that exceeds its threshold.
action potential - rapid, transient, self-propagating electrical excitation in the plasma membrane of a cell such as a neuron or muscle cell ...
The Action Potential
What is a nerve impulse? A nerve impulse, or an action potential, is a series of electrical responses that occur in the cell.
The action potential begins at one spot on the membrane, but spreads to adjacent areas of the membrane, propagating the message along the length of the cell membrane.
See: action potential.
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An increase in the threshold for an action potential that occurs in some neurons during a slowly developing or prolonged depolarization.
When a neuron is stimulated, the resting potential gives way to the action potential and the membrane is depolarized. The depolarization travels in one direction down the axon of the neuron to the opposite end of the cell.
The ApoE effects on calcium are not affected by the blockade of action potentials with tetrodotoxin, or by inhibition of common ApoE binding sites. The calcium channel involved has been identified as a P/Q-type-like channel.
intercalated disc
A specialized region in cardiac muscle which allows the action potential to spread to all cardiac muscle cells, causing the whole heart to contract.
 See also: Action, Cells, Neuron, Cell, Trans
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