What is the threshold of excitation necessary to initiate an action potential?
Events of the Neuron Action Potential

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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
-60 millivolts
-55 millivolts
-50 millivolts
-70 millivolts
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which part of the neuron is responsible for generating the action potential?
Axon terminals
Cell body
Axon hillock
Dendrites
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How does the action potential propagate along the axon?
In varying strengths
Randomly
Unidirectionally
Bidirectionally
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the rapid depolarization phase of an action potential?
Calcium influx
Chloride influx
Sodium influx
Potassium influx
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
During repolarization, which ion moves out of the cell?
Calcium
Chloride
Sodium
Potassium
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of voltage-gated sodium channels in action potential propagation?
They initiate repolarization
They prevent ion movement
They close the axon
They open sequentially to propagate the action potential
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the first sodium channel when the second one opens?
It remains open
It closes and repolarizes
It opens wider
It becomes inactive
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