Sample Questions — Structure of contractile proteins, Mechanism of muscle contraction
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MCQ
Cross-bridge cycling is driven by:
✅ Correct Answer: C
Energy from ATP hydrolysis fuels the formation and breakage of cross-bridges.
MCQ
5. What is the mechanism behind muscle contraction?
✅ Correct Answer: C
Sliding filament theory explains contraction by thin filament sliding over thick.
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MCQ
Why are red muscle fibres more fatigue-resistant than white fibres?
✅ Correct Answer: B
Red fibres contain more myoglobin and mitochondria, supporting aerobic respiration and fatigue resistance.
MCQ
Why does the head of myosin project outward in a regular pattern?
✅ Correct Answer: C
The head and short arm of HMM (myosin) project outward and help form cross-bridges with actin filaments.
MCQ
10. What causes muscle relaxation after contraction?
✅ Correct Answer: B
Reabsorption of Ca²⁺ causes re-masking of actin and muscle relaxation.
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