Propagation of an action potential along an axon is dependent on a(n):
A. Complete myelination of the axon by glial cells.
B. Anterograde diffusion of the electric potential with active generation of new potentials.
C. Rapid repolarization associated with passive diffusion of Cl–.
D. Retrograde diffusion of the electrical potential.
E. Na+/K+ pump moving sufficient quantities of Na+ into of the cell and K+ out of the cell.
ANS: B
Rationale: An action potential is a brief, large depolarization in electrical potential that is repeatedly regenerated along the length of an axon. Regeneration allows an action potential to actively spread long distances, transmitting information down the axon to the presynaptic chemical release sites of the presynaptic terminal.
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