The functional unit of contractile system in striated muscle is

Cross bridge

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Myofibril

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Sarcomere

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Z-band

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Solution

The correct option is B Sarcomere
Skeletal muscles are composed of striated subunits, called as sarcomeres, which are composed of the myofilaments actin and myosin. Sarcomeres are repeating subunits of thin and thick protein fibers within myofibrils, from one Z line to the next Z line. Hence, option C is correct.

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