Which statement is correct for muscle
contraction?
(a) Length of H-line decreases
(b) Length of A-band remains constant
(c) Length of I-band increases
(d) Length of two Z-lines increase
Answers
Answered by
1
The statement which is correct for muscle contraction is
option :(b) is correct
because of the following reason
*During muscle contraction, actin filaments slides over myosin filaments resulting in shortening of a sacromere.
*The middle of A-band is paler zone called as H- band.
*hence, the Length of A- band remains constant.
Answered by
1
Length of A-band remains constant is the correct statement for muscle contraction.
Option (b)
Explanation:
- Muscle is made of soft tissues that contains actin and myosin protein filaments which are responsible for muscle contraction.
- The basic contractile unit of muscle is sacromere.
- It is split into H-zone, A-band, I-band, M line and Z line.
- A-band consists of thin and thick filaments and dark area of sacromere.
- There is no change in the length of A-band in the sacromere.
- During muscle contraction, H-zone, I-bands become shorter.
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