Zoology - Locomotion and Movement Question with Solution | TestHub
Which of the following statement is/ are correct/incorrect?
I. A-bands of the muscle are dark and contain myosin.
II. I-bands are the light bands and contain actin.
III. During muscle contraction, the A-band contracts.
IV. The part between the two Z-lines is called a sarcomere.
V. The central gap of the thick filament, not overlapped by myosin filament is called H-zone.
Options:
Answer:
Solution:
During muscle contraction, the length of A-band remains constant, I-band shortens. H-zone is the area of A-band without thin filaments. This zone contains only thick filaments excluding the thin filaments on either side. So, H-zone in the skeletal muscle fiber is considered as an area due to the central gap between the actin filaments extending through myosin filaments in the A-band.
