The functional unit of contraction is a

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(A) The correct answer is $A$. The functional unit of muscle contraction is known as the $sarcomere$. It is defined as the portion of a myofibril that

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Portion of myofibril between two successive $Z$-lines

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(A) The correct answer is $A$. The functional unit of muscle contraction is known as the $sarcomere$. It is defined as the portion of a myofibril that lies between two successive $Z$-lines. During muscle contraction,these $sarcomeres$ shorten as the actin and myosin filaments slide past each other.

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