The functional unit of contractile system in a striated muscle is

sarcomere

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Z-band

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cross bridges

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myofibril

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Solution

The correct option is A sarcomere
The sarcomeres are fibrous protein filaments that slide past one another when the muscle contracts or relaxes. It is basically the region between two Z-bands. It is also the functional unit of the contractile system in a striated muscle.
So, the correct answer is 'sarcomere'.

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Sarcomere is the smallest contractile unit in a muscle fibre which is limited by the area between

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