The neurotransmitter-sensitive ion channels on muscle end plates differ from other ion channels in that:
A) they have a different resting membrane potential.
B) they allow only K+ to leave the neuronal membrane.
C) they allow only Cl- to leave the neuronal membrane.
D) K+ and Na+ enter and leave through the same channels.

Question

Quizplus · Accepted Answer

The neurotransmitter-sensitive ion channels on muscle end plates allow both K+ and Na+ to enter and leave through the same channels. This is important for the depolarization and contraction of the muscle fiber. Option A is incorrect because the resting membrane potential is not determined by the type of ion channels, but by the balance of ions inside and outside the cell. Options B and C are incorrect because these channels do not selectively allow only one type of ion to leave the neuronal membrane.

The Neurotransmitter-Sensitive Ion Channels on Muscle End Plates Differ from Other