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

question 47

Multiple Choice

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.

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