Question

Which of the following statement is not true about muscle contraction?

• A. Calcium ion helps in the binding of myofilaments
• B. The impulse of contraction reaches the muscle through nerves
  
• C. Energy is released as ATP at the actin head
• D. Contraction of sarcomere results in contraction of muscles

Answer 1

The correct option is C

Energy is released as ATP at the actin head

The impulse of contraction reaches the muscle through nerves and the calcium ion gets activated. The calcium ions help in binding actin and myosin filament. Actin binds with the head of the myosin filament and the energy is released in the form of ATP at the myosin head. Myosin head pulls the actin filament towards the centre of the sarcomere. Contraction of the sarcomere results in contraction of muscles.