Which of These Statements Correctly Describes Twitch Summation

question 27

Multiple Choice

Which of these statements correctly describes 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) A high level of calcium ion is not required in twitch summation.
• D) It results from increasing the frequency at which motor units are firing within a muscle.

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