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.

Question

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. (A) (i),(iii),(iv)and(v) (B) (i),(ii)and(v) (C) (ii),(iv)and(v) (D) (i),(ii)and(iii)

Tardigrade Admin · Accepted Answer

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.

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.

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

(i),(ii)and(v)

(ii),(iv)and(v)

(i),(ii)and(iii)

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.

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.