1. Tardigrade
  2. Question
  3. Biology
  4. During muscular contraction, which of the following events occur? (I) H-zoned is appears (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.

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Q. During muscular contraction, which of the following events occur?
(I) H-zoned is appears
(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.

AIIMSAIIMS 2012Locomotion and Movement

Solution:

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