The opening of more and more Na+ ion channels during depolarization
A)is the result of the sodium-potassium exchange pump.
B)is an example of a positive feedback cycle.
C)is possible only if K+ channels remain closed.
D)is the cause of the afterpotential.
E)is an example of a negative feedback cycle.

Question

Quizplus · Accepted Answer

The opening of Na+ ion channels during depolarization is an example of positive feedback because it leads to further depolarization, which in turn leads to more Na+ ion channels opening. This cycle continues until the threshold for an action potential is reached.

The Opening of More and More Na+ Ion Channels During