CVS Practice Test 2026 – Complete Exam Preparation

Question: 1 / 400

What happens to the A band during muscle contraction?

It becomes thinner

It does not change

During muscle contraction, the A band, which is the dark band in the sarcomere that contains the thick filaments (myosin), remains unchanged in length. This stability in length occurs because the overlapping thick and thin filaments do not shorten; instead, they slide past each other. The process of contraction primarily involves the shortening of the I bands and the H zone, while the A band retains its length throughout the contraction cycle. Understanding this mechanism is crucial, as it highlights the unique behavior of the A band during muscle contraction compared to other bands within the sarcomere that do undergo changes.

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It disappears

It lengthens

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