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Unformatted text preview: The Nervous System: The Action Potential
1 .
a. The action potential changes the membrane potential from
mV (resting) to
mV and back again to the resting membrane
potential.
b. This results from a change in membrane permeability first to
then to
due to the opening of what type of ion channels?
2.
a. Where is the density of voltage-gated Na channels the greatest?
b. What areas of the neuron generate signals that open these voltage-gated
channels?
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c. Opening of these channels causes the membrane to
( voltage change).
3.
a. If the membrane reaches the trigger point, known as
, what electrical potential will be generated?
b. During the depolarization phase, voltage-gated
channels open
and
enters the cell.
What are the two processes that stop the potential from rising above +30 mV?
a
b
5 .
a. The opening of voltage-gated K* channels cause the membrane to...
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