An Action Potential Travels in Only One Direction Because

question 3

Multiple Choice

An action potential travels in only one direction because

• A) the nodes of Ranvier are open only at the site of the action potential.
• B) only the sodium channels "downstream" are open.
• C) only the sodium channels at the site of the action potential remain open.
• D) sodium ions can move only between the nodes of Ranvier.

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