The dark band is known as which band?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

The dark band is known as which band?

Explanation:
The dark band is the A band. It contains the entire length of the thick (myosin) filaments and the zones where thick and thin filaments overlap, which makes it denser and darker under light microscopy. The lighter region, the I band, contains only actin and is bisected by the Z disc, while the central part of the A band, the H zone, has thick filaments with no overlap. During contraction, the I band and H zone shorten while the A band stays roughly the same length, reflecting that the dark band corresponds to the A band.

The dark band is the A band. It contains the entire length of the thick (myosin) filaments and the zones where thick and thin filaments overlap, which makes it denser and darker under light microscopy. The lighter region, the I band, contains only actin and is bisected by the Z disc, while the central part of the A band, the H zone, has thick filaments with no overlap. During contraction, the I band and H zone shorten while the A band stays roughly the same length, reflecting that the dark band corresponds to the A band.

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