Locomotion and Movement · NEET Preparation Zoology
A muscle fibre is deprived of ATP immediately after contraction. Which event is most likely to occur?
Practice question from Locomotion and Movement (NEET Preparation Zoology), with the correct answer and a step-by-step solution.
hard · MCQ · Q-E87925
A muscle fibre is deprived of ATP immediately after contraction. Which event is most likely to occur?
- A.Myosin heads detach rapidly from actin and the muscle relaxes.
- B.Calcium ions are actively pumped back into the sarcoplasmic reticulum.
- C.Myosin heads remain attached to actin, producing a state of stiffness.Correct answer
- D.Tropomyosin permanently exposes all active sites on actin.
Solution
ATP is required for the detachment of myosin heads from actin and for active pumping of calcium ions into the sarcoplasmic reticulum. In its absence, cross-bridges remain attached, causing muscular stiffness or rigor.
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