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NEETZoologyLocomotion and Movement

Steps of Muscle Contraction Description A. ATP Binding 1. Myosin head binds to actin filament, forming a cross-bridge B. Cross-Bridge Formation 2. Myosin head pivots, pulling the actin filament towards the center of the sarcomere C. Power Stroke 3 .ATP binds to the myosin head, causing it to detach from the actin filament D. Release of ADP and Pi 4. Release of ADP and Pi from the myosin head triggers the power stroke

Options

  1. AA - 1, B - 4, C - 3, D - 2
  2. BA - 4, B - 2, C - 1, D - 3
  3. CA - 2, B - 3, C - 4, D - 1
  4. DA - 3, B - 1, C - 2, D - 4

Correct answer

D. A - 3, B - 1, C - 2, D - 4

Step-by-step solution

ATP Binding: ATP binds to the myosin head, leading to its detachment from actin. Cross-Bridge Formation: Myosin head binds to actin, forming a cross-bridge. Power Stroke: The myosin head pivots, pulling the actin filament towards the center of the sarcomere. Release of ADP and Pi: This release triggers the power stroke, allowing contraction.

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