Chapter 8 HW Question & Answers
1.
Where do most action potentials originate?
a.
Initial Segment
2.
What opens first in response to a threshold stimulus?
a.
Voltage-gated Na+ channels
3.
What characterizes depolarization, the first phase of the action
potential?
a.
The membrane potential changes from a negative value to a
positive value
4.
What characterizes repolarization, the second phase of the action
potential?
a.
Once the membrane depolarizes to a peak value of +30 mV, it
repolarizes to its negative resting value of -70 mV.
5.
What event triggers the generation of an action potential?
a.
The membrane potential must depolarize from the resting
voltage of -70 mV to a threshold value of -55 mV.
6.
What is the first change to occur in response to a threshold stimulus?
a.
Voltage-gated Na
+
channels change shape, and their activation
gates open.
7.
What type of conduction takes place in unmyelinated axons?
a.
Continuous Conduction
8.
An action potential is self-regenerating because
a.
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- Fall '19
