What is the relationship between the refractory period and the propagation of action potentials?
A) Refractory periods allow action potentials to propagate in two directions.
B) Action potentials propagate in one direction because of refractory periods.
C) The refractory period increases the speed of action potentials.
D) Action potentials are restricted to nodes of Ranvier because of refractory periods.
Correct Answer:
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