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28 Cards in this Set
- Front
- Back
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the action potential consists of
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depolarization - propagation - repolarization
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if depolarization reaches threshold (+15-20mv) an ____ ____ is triggered
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action potential
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positive rmp change causes ____ gates in the ____ ____ to open
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electrical - axon hillock
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a sudden influx of ____ ____ causes a reversal in the membrane potential (+100mv)
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sodium ions
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the action potential begins at the ____ ____ and travels down the axon
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axon hillock
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chemically gated ion channels are located on
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dendrite - soma
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voltage gated ion channels are located on
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axon hillock - axon
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propagation is the movement of the action potential down the ____
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axolemma
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during propagation voltage gated sodium channels open in response to ____ rmp change
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positive
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repolarization Is restoration of rmp back to its ____ ____
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negative state
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a repolarization wave follows the
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depolarization wave
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in repolarization Na+ gates
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close
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in repolarization potassium gates ____ and K+ rushes ____
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open - out
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in repolarization the ____- ____ pump kicks in
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sodium-potassium
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sodium-potassium pump is an ____ ____ process that requires ____ energy
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active transport - cellular
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sodium-potassium pump actively pumps ____ Na+ ions out of cell & ____ K+ ions in
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3 -2
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absolute refractory period is period of time when ____ ____ gates are open
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electrical sodium
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during absolute refractory period the neuron is incapable responding to ____ no matter how strong
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stimulus
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in summation a single epsp cannot induce
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an action potential
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in summation epsp's can ___ to initiate an ____ ____
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summate - action potential
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2 types of summation
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spatial - temporal
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in spatial summation, large number of ____ ____ stimulate the ____ ____ simultaneously
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axon terminals - postsynaptic neurons
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in temporal summation, 1 or more ____ neurons transmit impulses in rapid fire succession
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presynaptic
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all or none response is when threshold is reached, the action potential will
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occur completely
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all or none response is if threshold is not reached, the action potential will
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not occur at all
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saltatory conduction occurs only in
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myelinated axons
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in saltatory conduction depolarization wave ____ from 1 ____ ____ ____ to the next
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jumps - node of ranvier
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saltatory conduction results in
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faster nerve impulse transmission
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