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AIIMS2012ZoologyLocomotion and Movement

During muscular contraction, which of the following events occur? (i) H-zone disappears (ii) A band widens (iii) I band reduces in width (iv) Width of A band is unaffected (v) M line and Z line come closer.

Options

  1. A(i), (iii), (iv) and (v)
  2. B(i), (ii) and (v)
  3. C(ii), (iv) and (v)
  4. D(i), (ii) and (iii)

Correct answer

A. (i), (iii), (iv) and (v)

Step-by-step solution

Muscle contraction is brought about by sliding of the actin filaments over myosin filaments. When a muscle fibril contracts, its A band remains constant and I band shortens. H zone also disappears as the actin filaments of both sides in each sarcomere may overlap each other at M line.

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