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Which region of the sarcomere shortens during contraction the dark band the light band or both?
Wiki User
∙ 11y ago
Dark
Wiki User
∙ 11y ago
During contraction, the H zone and I band shorten while the A band remains the same length. The A band is the dark band in the sarcomere that contains the thick filaments, the I band is the light band composed of thin filaments, and the H zone is the area in the center of the sarcomere where only thick filaments are present.
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