Why are action potentials conducted usually in one direction along an axon?
A) The nodes of Ranvier conduct potentials only in one direction.
B) The brief refractory period prevents reopening of voltage-gated sodium channels.
C) The axon hillock has a higher membrane potential than the terminals of the axon.
D) Voltage-gated channels for both Na+ and K+ open in only one direction.

Question

Quizplus · Accepted Answer

The brief refractory period after an action potential ensures that the voltage-gated sodium channels cannot immediately reopen, preventing the action potential from moving backward and thus ensuring its unidirectional propagation along an axon.

Why Are Action Potentials Conducted Usually in One Direction Along