Question

During contraction, the band remains a constant length. This band is composed primarily of molecules. Which components of the sarcomere approach each other during contraction?

Answer 1

During muscle contraction, the I band and the H zone approach each other.

Step-by-step explanation:

During muscle contraction, the I band and the H zone approach each other. The I band, which contains only thin filaments, becomes smaller as the thin filaments are pulled closer to the center of the sarcomere. The H zone, located within the A band and containing only thick filaments, also becomes smaller during contraction. The A band, which contains both thin and thick filaments, remains the same width but the A bands of different sarcomeres move closer together.