Rigor mortis occurs due to
Correct answer: B. Lack of ATP
- A. Excess ATP
- B. Lack of ATP
- C. Excess calcium
- D. Lack of calcium
Explanation
Without ATP, myosin heads cannot detach from actin, causing persistent muscle contraction (rigor mortis).
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About Muscle Contraction
Muscle contraction is explained by the sliding filament model, in which myosin heads pull actin filaments within sarcomeres using ATP. The topic covers calcium, troponin, tropomyosin, the neuromuscular junction and relaxation, with attention to how filament length stays almost constant while the sarcomere shortens.
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