Muscle Fibers Show a Range of Responses to Different Levels

question 79

Multiple Choice

Muscle fibers show a range of responses to different levels of stimulation because

• A) each muscle fiber contraction is "all or none."
• B) the availability of Ca²⁺ sets an upper limit to the strength of the contraction.
• C) a new contraction can occur only after the resting condition is reached.
• D) following stimulation, the fiber stays contracted.
• E) individual twitches in the same fiber can summate.

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