Q. Which one of the following takes place in a myofibril when skeletal muscle contract
Light band Dark band H-zone
1. Shortens Shortens Shortens
2. Shortens Unchanged Unchanged
3. Shortens Unchanged Disappears
4. Unchanged Shortens Shortens
Dear student,
There is no change in the lengths of light and dark bands during contraction. only the H zone shortens when there is a contraction of muscles.
So the options mentioned in the question are not correct because there is no change in the light as well as in the dark band. H zones becomes shorten.
Regards