Which statement about ion channels and voltage-gated ion channels is true?
A) Voltage-gated ion channels are always open.
B) Ion channels allow ions to flow against their concentration gradients.
C) Voltage-gated ion channels only open when a stimulus is applied.
D) Ion channels do not contribute to resting membrane potential.

Question

Quizplus · Accepted Answer

Voltage-gated ion channels are only activated when a change in voltage occurs, such as during an action potential. Ion channels, in general, do contribute to resting membrane potential by selectively allowing ions to flow across the membrane. Choices A and B are incorrect.

Which Statement About Ion Channels and Voltage-Gated Ion Channels Is