Multiple choice

The process of a muscle contracting is a complex process. Which of the following statements does not characterise muscle contraction in humans?

  1. A nervous impulse comes at the neuromuscular junction and from the terminal Acetylcholine is released.

  2. In the presence of high concentrations of Ca+, the Ca+ binds to Tropomyosin.

  3. The breakdown of ATP helps in the shortening ot the muscle.

  4. The Myosin leaves the Actin and the cross-bridge is broken when an ATP molecule binds to the Myosin head.

  5. The process of muscular contraction can last for as long as there is adequate ATP.
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B Correct answer
Explanation

This is the wrong statement. In the presence of high concentrations of Ca2+, the Ca2+ binds to troponin, changing its shape and so moving tropomyosin from the active site of the actin. The myosin filaments can now attach to the actin, forming a cross-bridge.

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