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Troponin binds calcium ions, which trigger the movement of tropomyosin to expose myosin-binding sites on actin.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle Contraction - Sliding Filament Theory and Regulation
Tropomyosin regulates muscle contraction by blocking the myosin-binding sites on actin filaments.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament
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