When a Skeletal Muscle Cell Contracts and the Muscle Shortens

question 89

Multiple Choice

When a skeletal muscle cell contracts and the muscle shortens,

• A) myosin heads generate a single power stroke.
• B) the position of an actin molecule relative to a myosin molecule does not change.
• C) some myosin heads are forming crossbridges as others are releasing them.
• D) the actin ATPase allows the actin molecule to swivel.
• E) the actin molecule swivels during the power stroke.

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