Why Are Action Potentials Sometimes Described as Being "All-Or-None" in Character

question 42

Multiple Choice

Why are action potentials sometimes described as being "all-or-none" in character?

• A) The rate of propagation of an action potential down an axon is independent of stimulus strength.
• B) They are associated with an absolute refractory period.
• C) A supra-threshold stimulus is required to stimulate an action potential during the relative refractory period.
• D) An action potential occurs whenever a suprathreshold stimulus occurs, and its amplitude does not vary with the size of a stimulus, as long as the membrane is not in the refractory period.
• E) Action potentials are always the same size, even when ion gradients vary in size.

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