Rigor mortis after death results due to which?
Correct answer: D. Unavailability of ATP, which is necessary to break the link between actin and myosin.
- A. Decrease in body temperature after death.
- B. Accumulation of rigid proteins molecules in arcoplasm.
- C. Death of tissue due to unavailability of O2
- D. Unavailability of ATP, which is necessary to break the link between actin and myosin.
Explanation
Rigor mortis is a postmortem process that occurs in the muscles of a deceased individual, and it is caused by a lack of ATP (adenosine triphosphate) in the muscle fibres.
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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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