A muscle fibre cannot relax because ATP is no longer available. Which process is directly prevented?
Correct answer: C. Separation of myosin heads from actin
- A. Release of calcium from the sarcoplasmic reticulum
- B. Attachment of oxygen to haemoglobin
- C. Separation of myosin heads from actin
- D. Formation of acetylcholine in the nerve cell
Explanation
ATP is needed for myosin heads to detach from actin after a power stroke. Without ATP, cross-bridges remain attached, which contributes to muscle stiffness.
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About Skeletal and Muscular Systems
The skeletal and muscular systems include bone structure, joints, cartilage, the axial and appendicular skeleton, and the roles of ligaments and tendons. They also cover skeletal muscle organization, the sliding filament mechanism, neuromuscular contraction, and common differences between voluntary skeletal muscle, cardiac muscle and smooth muscle.
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