Why do action potentials travel in only one direction? Choose the correct option
A) The membrane just behind the action potential is refractory due to inactivated potassium channels.
B) The membrane just behind the action potential is refractory due to inactivated sodium channels.
C) The membrane proteins are destroyed when an action potential fires and it takes time to replace them.
D) There is not enough sodium in the extracellular space after an action potential has just fired.
Ans: B
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