MUSCLE
SKELETAL MUSCLE
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Question
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Small, contractile units stacked end-to-end in myofibrils.
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Myofibril
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Myofilaments
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Sarcomere
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Sarcolemma
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Explanation:
Detailed explanation-1: -The sarcomere is the smallest contractile unit in the myofibril. Sarcomeres contract because the Z-lines move closer together. As the sarcomeres contract the myofibrils contract. As the myofibrils contract the muscle cell contracts.
Detailed explanation-2: -The contractile functional unit of the myofibril is called the sarcomere, which is approximately 1.6–2.0 m in length.
Detailed explanation-3: -According to sliding filament theory of muscle contraction, the actin and myosin filament slide past each other with the help of cross bridge to reduce the length of the sarcomeres. The smallest unit of muscle contraction is a sarcomere(which is delineated by Z-lines).
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