Which of these structures is the smallest unit of contraction within a skeletal muscle

Name: Which of these structures is the smallest unit of contraction within a skeletal muscle
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Question

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A sarcomere is the smallest unit of contraction within a skeletal muscle. It consists of overlapping thick and thin filaments that slide past each other during muscle contraction. A myofibril is a bundle of sarcomeres, a muscle fiber is a bundle of myofibrils, and a thin filament is a component of a sarcomere.

Which of These Structures Is the Smallest Unit of Contraction