PHYSIOLOGY
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: -A sarcomere is the basic contractile unit of a myocyte (muscle fibre). A sarcomere is composed of two main protein filaments (thin actin and thick myosin filaments) which are the active structures responsible for muscular contraction.
Detailed explanation-2: -The sarcomere is the fundamental contractile unit of the myofibril. Z lines separate each sarcomere. The A bands, located at the center of each sarcomere, contain the thick filaments, which may overlap with thin filaments.
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