A "resting" motor neuron is expected to
A)releases lots of acetylcholine.
B)to have high permeability to sodium ions.
C)to be equally permeable to sodium and potassium ions.
D)exhibit a resting potential that is more negative than the "threshold" potential.
E)have a higher concentration of sodium ions on the inside the cell than on the outside.

Question

Quizplus · Accepted Answer

Resting motor neurons have a resting potential that is more negative than the "threshold" potential, which is required to trigger an action potential. At rest, motor neurons maintain a relatively high permeability to potassium ions, which leads to an excess of negatively charged ions inside the cell. This contributes to the negative resting potential. Sodium ions are also present, but they are more concentrated outside the cell, contributing to the overall negative charge inside the cell. Resting motor neurons do not release acetylcholine until an action potential is triggered.

A "Resting" Motor Neuron Is Expected to