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Nervous System I: The Action Potential

Interactive Physiology® Quiz: Nervous System I: The Action Potential

This activity contains 10 questions.

Question 1
1 The action potential is a transient change in the resting membrane potential from -70 mV to +30 mV, then back to -70 mV. This change is caused by the opening of first _____ then _____ voltage-gated channels.
 
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Question 2
2 What area(s) of the neuron generate signals that open the voltage-gated channels in the first part of the axon, thus causing an action potential?
 
End of Question 2


Question 3
3 As the axon hillock depolarizes, Voltage-gated Na+ channels open and Na+ moves (into or out of) __________ the cell causing further (depolarization or repolarization) __________.
 
End of Question 3


Question 4
4 If depolarization reaches -55 mV, an action potential will be generated. What is this -55 mV trigger point called?
 
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Question 5
5 At the end of the depolarization phase, what voltage-gated channels open to help restore the resting membrane potential?
 
End of Question 5


Question 6
6 Repolarization is caused by the movement of what ion (sodium or potassium), in what direction (into or out of the cell)?
 
End of Question 6


Question 7
7 After an action potential, the membrane becomes more negative than -70 mV. This period is called:
 
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Question 8
8 After a neuron has generated an action potential, it cannot generate another one for a while. This period is called:
 
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Question 9
9 The fastest conduction of an action potential would occur in an axon with which of the following characteristics?
 
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Question 10
10 What is the name of the disease in which the myelin sheaths of central nervous system axons are destroyed?
 
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