The Factor(s)that Determine the Duration of a Twitch in Various

question 18

Multiple Choice

The factor(s) that determine the duration of a twitch in various types of fibers is the speed of the

• A) removal of Ca²⁺ ions from the sarcoplasm only.
• B) hydrolysis of ATP only.
• C) movement of Na⁺ across their membranes only.
• D) removal of Ca²⁺ ions from the sarcoplasm and hydrolysis of ATP.
• E) removal of Ca²⁺ ions from the sarcoplasm and hydrolysis of ATP and movement of Na⁺ across their membranes.

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