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Functional unit of skeletal muscle is the:

AATP
BCell
CMyosin
DSarcomere (segment between two Z-discs)
Answer & Solution
Correct answer: D. Sarcomere (segment between two Z-discs)
**Sarcomere:** contractile unit. Spans Z-line to Z-line. Contains thin filaments (actin) anchored to Z, thick filaments (myosin) in center (M-line). **Bands:** A (thick filament length, dark), I (thin only, light), H (thick only, in middle). Shortens during contraction.
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