Twitch Summation

question 249

Multiple Choice

Twitch summation

• A) is a means by which gradation of muscle contraction may be accomplished.
• B) results from increasing the number of motor units that are firing within a muscle.
• C) results from increasing the frequency at which motor units are firing within a muscle.
• D) both (a) and (b) above.
• E) both (a) and (c) above.

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