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NEETZoologyLocomotion and Movement

Choose the correct statement w.r.t diagram shown:

Options

  1. AUtilising the energy from ATP formation, the myosin head now binds to the exposed active sites on actin to for
  2. BActin filaments are pushed away from the centre of ‘A’ band.
  3. CMyosin releases the ADP and P1 and goes back to its relaxed state.
  4. DA new ADP binds and the cross-bridge is broken.

Correct answer

C. Myosin releases the ADP and P1 and goes back to its relaxed state.

Step-by-step solution

Muscle contraction is initiated by a signal sent by the central nervous system (CNS) via a motor neuron. A motor neuron alongwith the muscle fibres connected to it constitute a motor unit. The junction between a motor neuron and the sarcolemma of the muscle fibre is called the neuromuscular junction or motor-end plate. A neural signal reaching this junction releases a neurotransmitter (Acetyl choline) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release

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