Which Statement Is Correct for Twitch Summation

question 113

Multiple Choice

Which statement is correct for twitch summation?

• A) It is a means by which weak muscle contraction may be accomplished.
• B) It results from increasing the number of motor units that are firing within a muscle.
• C) It results from increasing the frequency at which motor units are firing within a muscle.
• D) A high level of calcium ion is not required in twitch summation.

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