NEETZoologyLocomotion and Movement
Molecular Component Role in Muscle Contraction A. Calcium Ions (Ca²⁺) 1 .Shifts to expose the myosin-binding sites on actin B. Troponin 2. Binds to calcium ions, causing a conformational change C. Tropomyosin 3 .Hydrolyzes ATP to provide energy for muscle contraction D. Myosin ATPase 4. Binds to troponin, leading to the displacement of tropomyosin
Options
- AA - 2, B - 1, C - 3, D - 4
- BA - 4, B - 2, C - 1, D - 3
- CA - 3, B - 4, C - 2, D - 1
- DA - 1, B - 3, C - 4, D - 2
Correct answer
B. A - 4, B - 2, C - 1, D - 3
Step-by-step solution
Calcium Ions (Ca²⁺): Binds to troponin, leading to the displacement of tropomyosin. Troponin: Binds to calcium ions, causing a conformational change that affects tropomyosin. Tropomyosin: Shifts to expose the myosin-binding sites on actin, allowing contraction. Myosin ATPase: Enzyme that hydrolyzes ATP to provide energy for muscle contraction.