Which Statement About Slow-Twitch and Fast-Twitch Muscles Is True

question 28

Multiple Choice

Which statement about slow-twitch and fast-twitch muscles is true?

• A) One is smooth muscle and one is skeletal muscle.
• B) They have different myosin variants because they express different genes for their myosin molecules.
• C) One occurs only in mammals.
• D) They typically have similar numbers of mitochondria per cell.
• E) Those with low ATPase activity compensate by quickly recycling their actin-myosin bridges.

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