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(A) The sarcomere is the functional and structural unit of a muscle fiber. It is defined as the region of a myofibril located between two successive $

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Sarcomere

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(A) The sarcomere is the functional and structural unit of a muscle fiber. It is defined as the region of a myofibril located between two successive $Z-$lines (or $Z-$discs). These $Z-$lines anchor the actin filaments,and the contraction of the muscle occurs due to the shortening of the sarcomere.

The region between two successive $Z-$lines in a myofibril is

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