As skeletal muscle shortens with contraction, the length of the I band remains constant as the length of the A band decreases.

Question

Quizplus · Accepted Answer

During skeletal muscle contraction, the length of the I band decreases while the length of the A band remains constant. The I band contains only thin filaments, which are pulled closer together as the muscle contracts, reducing its length. The A band, which contains the entire length of a single thick filament, does not change in length because the thick and thin filaments slide past each other without changing their own lengths.

As Skeletal Muscle Shortens with Contraction, the Length of the I