Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?
A) Presynaptic terminals have no acetylcholine receptors.
B) Presynaptic neurons do not have a resting membrane potential.
C) Acetylcholine can only diffuse in one direction across the synaptic cleft.
D) Synaptic vesicles in the postsynaptic membrane are inactive.
E) Acetylcholine is destroyed too quickly.

Question

Quizplus · Accepted Answer

Presynaptic terminals lack acetylcholine receptors, which are necessary for receiving the chemical signals that would trigger an action potential in the direction of the presynaptic neuron. Action potentials are unidirectional, moving from the presynaptic neuron to the postsynaptic neuron, not the reverse.

Why Isn't an Action Potential Transmitted from a Postsynaptic Membrane