An axon that has a -55 mv electric potential across its membrane ____.
A) probably does not have any myelin sheathing
B) is going to fire an action potential
C) has a very large concentration of Na+ ions inside the axon
D) has just released several neurotransmitters

Question

Quizplus · Accepted Answer

An electric potential of -55 mv across the membrane of an axon is the threshold potential which means that the axon is going to fire an action potential. This is the point at which the voltage-gated ion channels (primarily Na+ channels) open, triggering depolarization and the onset of an action potential. The myelin sheathing is not mentioned in the question and hence, cannot be determined from the given information. A high concentration of Na+ ions inside the axon is not generally associated with this phenomenon, and releasing neurotransmitters is not directly linked to the electric potential of the axon membrane.

An Axon That Has a -55 Mv Electric Potential Across