Which of the following is NOT a true statement about the conduction of action potentials in axons?
A. The inward Na+ current of an AP generates an AP in an adjacent portion of the axon.
B. All APs in a given axon are identical in magnitude and duration.
C. APs can be conducted in only one direction.
D. The velocity of AP conduction is positively correlated with axon diameter.
E. The frequency of APs is limited by the length of the refractory period.
ANS: C
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