Blocking the voltage-gated sodium channels will have what effect on the action potential?
a. The membrane potential will be more positive than normal (greater depolarization)
b. The membrane will not depolarize (no action potential)
c. The membrane will depolarize but not repolarize
d. The membrane will hyperpolarize
Answer: b. The membrane will not depolarize (no action potential)
Explanation:
Sodium channel is responsible for depolarization.
Potassium channel is responsible for repolarization\hyperpolarization.
Blocking of sodium channel will prevent depolarization.
Depolarization is required for action potential.
No sodium channel = No depolarization = No action potential.
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