ATP expenditure is required for both contraction and relaxation of a muscle fiber.

Name: ATP expenditure is required for both contraction and relaxation of a muscle fiber.
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Contraction and relaxation of a muscle fiber both require ATP expenditure. During contraction, ATP is hydrolyzed to provide energy that powers the sliding of actin and myosin filaments. During relaxation, ATP is needed to pump calcium ions back into the sarcoplasmic reticulum, allowing the muscle to return to its resting state.

ATP Expenditure Is Required for Both Contraction and Relaxation of a Muscle