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ATPase enzyme needed for muscle contraction is located in

1. actinin
2. troponin
3. myosin
4. actin

Correct answer: myosin

Solution

Myosin heads have ATPase activity, which hydrolyzes ATP to provide energy for muscle contraction and cross-bridge movement. Actin, troponin, and actinin do not serve as the main ATPase enzyme for contraction.

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