Voltage-activated channels are channels for which a change in the voltage across the membrane alters their ____.
A) permeability
B) length
C) number
D) threshold

Question

Quizplus · Accepted Answer

Voltage-activated channels are channels that respond to changes in the membrane potential of a cell, which means a change in voltage across the membrane alters their permeability by allowing specific ions to cross the cell membrane. Therefore, (A) permeability is the correct answer. (B) length is incorrect because channels are not capable of changing their length, (C) number is incorrect because the number of channels in a membrane is regulated by different factors, and (D) threshold is incorrect because the threshold is the minimum amount of energy required to generate an action potential, not the property of the channel itself.

Voltage-Activated Channels Are Channels for Which a Change in the Voltage