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22 Cards in this Set

  • Front
  • Back
3 processes in an action potential
depolarization - propagation - repolarization
what type of ion channel open at the axon hillock
how do voltage-gated ion channels open
15-20mv positive change
what type of ion channels are opening or closing during repolarization
potassium opening - sodium closing
how are ion channels gated during repolarization
what contributes to the negative rmp
k+ leaks out - sodium-potassium pump
where on the neuron would you find chemically-gated ion channels
dendrite - soma
what causes voltage-gated channels to open
15-20mv positive change in rmp
where on the neuron would you find voltage-gated ion channels
axon hillock through the entire axon
what is it if ion channels in chemically-gated open just long enough to cause a small positive change but not enough for an action potential
graded potential (EPSP)
if neurotransmitter binds to receptor on postsynaptic membrane resulting in entrance of Cl- ions what happens to rmp
rmp becomes more negative (IPSP)
____ is when the postsynaptic neuron becomes more negative
hyperpolarization (IPSP)
if postsynaptic membrane had small regions of hyperpolarization these local occurrences of hyperpolarization would be called
what type of neurotransmitter would cause resulting ipsp's when bound to a postsynaptic receptor
what is the process called when the depolarization jumps from one node of ranvier to another
saltatory conduction
explain sodium-potassium pump mechanism
atp driven - 3 Na+ out - 2 K+ in
when is the sodium potassium pump used to re-establish a negative rmp
what causes influx of calcium ions in axon terminal
action potential (nerve impulse)
what is the result of the calcium influx (2)
vesicles fuse to membrane + release of neurotransmitters
if a stimulatory neurotransmitter binds to the postsynaptic receptors what happens (3)
Na+ channels open - Na+ rushes in - depolarization (EPSP)
convergence of neurons means
2 neurons goes to 1
divergence of neurons means
1 neuron goes to 2