AIIMS 2012
- Exam
- AIIMS
- Year
- 2012
- Subject
- Zoology
- Chapter
- Locomotion and Movement
AIIMS 2012 · Zoology · Locomotion and Movement
During muscular contraction, which of the following events occur?...
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 line come closer.
Options
- A(i), (iii), (iv) and (v)
- B(i), (ii) and (v)
- C(ii), (iv) and (v)
- 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. zone also disappears as the actin filaments of both sides in each sarcomere may overlap each other at M line.