Which if the following is true about voltage-gated Na⁺ channels in the axon? A) They remain open as long as the membrane is sufficiently hyperpolarized. B) They remain open as long as the membrane is sufficiently depolarized. C) They remain open for only a short period of time after the cell is sufficiently depolarized. D) They belong to a family of channels that are made of five subunits. E) They have about the same relative permeability ratio (P_Na/P_K) as ACh channels.

Question

Quizplus · Accepted Answer

Voltage-gated Na+ channels open for a short period of time after the cell membrane is sufficiently depolarized, allowing Na+ ions to enter the cell rapidly, contributing to the rising phase of the action potential. They do not remain open as long as the membrane is depolarized or hyperpolarized, are not made of five subunits, and have different permeability ratios compared to ACh channels.

Which If the Following Is True About Voltage-Gated Na+ Channels

Which If the Following Is True About Voltage-Gated Na⁺ Channels