Which of the Following Is Involved in the Gradation of Muscle

question 275

Multiple Choice

Which of the following is involved in the gradation of muscle contraction?

• A) variation in the number of motor units activated
• B) variation in the frequency of action potentials initiated in each muscle fiber
• C) variation in the size of the action potentials initiated in each muscle fiber
• D) both (a) and (b) above.
• E) all of these answers.

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