Cytological examination of resting and contracted muscle provides important support for the sliding filaments model for how skeletal muscle contracts. this evidence includes the observation that during contraction the

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26-07-2018
Biology

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Cytological examination of resting and contracted muscle provides important support for the sliding filaments model for how skeletal muscle contracts. this evidence includes the observation that during contraction the

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Larus Larus · Answer 1 · 2018-08-06T08:31:18+02:00

The correct answer is that the H zone becomes narrower.

The H-band refers to the region of the thick filaments, which is not overlaid by the actin (thin filaments). Within the H-zone is a thin M-line, which is formed of cross-connecting components of the cytoskeleton.

At the time of muscle contraction, the A-bands do not vary in their length, whereas the H-zone and the I-bands shorten. This makes the Z-lines come near to each other.