Contractile unit of muscle fibres is

Muscle fibre

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Sacromere

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Myofibril

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Sacrosome

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Solution

The correct option is B Sacromere
The entire cross section of the muscle fibre is taken up by long, cylindrical strands of contractile proteins called myofibrils. One myofibril is divided into segments called sarcomeres. These are the contractile units of a muscle. A dark stripe called a Z disc marks the ends of one sarcomere and the beginning of the next.

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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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