Rigor mortis i.e, stiffening of body after death results from__________?
Correct answer: B. Unavailability of ATP, which is necessary to break the link between actin and myosin.
- A. Accunulation of rigid proteins molecules in sarcoplam.
- B. Unavailability of ATP, which is necessary to break the link between actin and myosin.
- C. Decrease in body temperature after death.
- D. Death of tissue due to unavailability of O2.
Explanation
After death, ATP production stops, so myosin heads cannot detach from actin because ATP is required for their release. Students may choose decrease in body temperature, but cooling can contribute to stiffness while ATP depletion is the direct cause of 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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