Which statement about voltage-gated channels is true?
A) They open or close in response to a change in voltage across the cell membrane.
B) They all open and close at the same time in response to an action potential.
C) Ions can move through the channels only if the overall membrane potential stays the same.
D) Ions are pumped through the channels to maintain the existing membrane potential.
E) They open only in response to an action potential.

Question

Quizplus · Accepted Answer

Voltage-gated channels open or close in response to changes in voltage across the cell membrane. This allows ions to move through the channel and contribute to the electrical signals in the cell. B, C, D and E are incorrect as voltage-gated channels do not all open and close at the same time, ions can move through the channels even if the membrane potential changes, ions are not pumped through the channels, and channels can open in response to other stimuli besides an action potential.

Which Statement About Voltage-Gated Channels Is True