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The flashcards below were created by user
JJLT
on FreezingBlue Flashcards.
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Resting Membrane Potential.
-70mV
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Spend majority of time in closed state which allows them to regulate movement of ions.
Gated channels
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Gradual difference in concentration of a dissolved substance in a solution between a region of high density and one of lower density.
Gradient
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Inhibits action potentials by increasing the stimulus required to move the membrane potential to the action potential threshold; becomes more negative.
Hyperpolarization
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Moves away from resting membrane potential; becomes less negative.
Hypopolarization
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Chemical element symbol for Potassium.
K+
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Open to release potassium after depolarization.
K+ gates
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Difference in electrical potential between the interior and exterior of a cell.
Membrane Potential
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Chemical element symbol for Sodium.
Na+
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Open when neuron is stimulated allowing Na+ to rush in resulting in depolarization.
Na+ gates
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Period of time a cell is incapable of an action potential; amount of time it takes an excitable membrane to be ready for another stimulus.
Refractory Period
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Electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage of an impulse.
Resting Potential
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The critical level to which the membrane potential must be depolarized in order to initiate an action potential.
Threshold
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Changes in membrane potential that vary in size.
Graded Potential
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Change of electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell.
Action Potential
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Phenomenon in which a nerve cell impulses completely when exposed to a threshold stimulus or not at all.
All or None Response
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First location that will reach threshold.
Axon Hillock
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Reversal of the resting potential in excitable cell membranes when stimulated.
Depolarization
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In a multipolar neuron, the first part of axon (initial segment) contains many voltage-gated Na+ channels.
Trigger Zone
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Period immediately following the firing of a nerve fiber when it cannot be stimulated no matter how great a stimulus is applied.
Absolute Refractory
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The period following the firing of a nerve fiber during which initiation of a second action potential is inhibited but not impossible.
Relative Refractory
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Movement of an impulse along the axon.
Impulse Propagation
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Impulse conduction along axon that seems to jump (node to node) on myelinated axon.
Salutatory Conduction
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