A sarcomere is the contractile unit between two Z discs. It is the basic functional unit of muscle fibers in skeletal and cardiac muscles. The sarcomere is responsible for muscle contraction and is composed of thick and thin filaments that slide past each other to produce movement. The Z discs serve as the boundaries of the sarcomere, anchoring the thin filaments and providing structural stability. This arrangement allows for the efficient and coordinated contraction of muscle fibers.
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