Electron microscopic studies of the sarcomeres have revealed that during muscle contraction

Options

A. The width of A–band remains constant
B. The width of the H–zone becomes smaller
C. The width of I–band increases
D. The diameter of the fibre increases

Answer

A, B

Explanation

During muscle contraction and length and of A – band remain constant
* The width of I – band reduces.
* The diameter of fiber decreases.
* The width of H – zone become smaller.