ATP is required during muscle contraction for
Correct answer: B. detaching myosin heads from actin and pumping calcium back after contraction
- A. storing glycogen in the muscle
- B. detaching myosin heads from actin and pumping calcium back after contraction
- C. synthesising haemoglobin
- D. nothing once contraction has begun
Explanation
Each myosin head needs a fresh ATP to release actin and re-cock, and the calcium pump needs ATP to restore relaxation. Without ATP the heads stay locked, which is exactly what causes rigor mortis.
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The human skeleton provides support, protects organs, enables movement with muscles and stores minerals while bone marrow produces blood cells. Questions cover the axial and appendicular skeleton, types of bones and joints, cartilage, ligaments and tendons, and the difference between fixed, slightly movable and freely movable joints.
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