Question

During muscle contraction, which of the following decreases in size?

• A. I band
• B. A band
• C. H zone
• D. Both A and C

Answer 1

The correct option is D Both A and C

When muscle contracts,

• The Z discs come close together.
• The width of the I bands decreases.
• The width of the H zones decreases.
• There is, however, no change in the width of the A band.

Thus, the correct answer is the option D.