NEETZoologyLocomotion and Movement
Protein Function A. Actin 1. Binds to calcium and regulates muscle contraction B. Myosin 2. Forms thin filaments, interacts with myosin for contraction C. Troponin 3. Blocks myosin binding sites on actin D. Tropomyosin 4. Forms thick filaments, has ATPase activity
Options
- AA - 2, B - 4, C - 1, D - 3
- BA - 4, B - 3, C - 2, D - 1
- CA - 1, B - 4, C - 3, D - 2
- DA - 3, B - 1, C - 4, D - 2
Correct answer
A. A - 2, B - 4, C - 1, D - 3
Step-by-step solution
Actin: Forms thin filaments, interacts with myosin during contraction. Myosin: Forms thick filaments, has ATPase activity. Troponin: Binds to calcium and regulates contraction by shifting tropomyosin. Tropomyosin: Blocks myosin binding sites on actin, preventing contraction.