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what happens to a muscle fiber when the sarcomere shortens?

what happens to a muscle fiber when the sarcomere shortens?
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Answer:- when the sarcomeres arranged linearly shortens, the striated muscle fibre contraction occurs. During shortening of sarcomeres, there is formation of cross bridge between actin and myosin head. The region where thick and thin filaments overlap has a dense appearance, as there is little space between the filaments. Actin filaments anchored at their ends by the Z disc, do not extend completely into the central region that contains only thick filaments . A muscle fibre composed of many sarcomeres running along its length . Thus when sarcomeres shortens , these muscle fibres also contracts.

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