Myosin - the contractile protein that makes up the thick filament of muscle fibers, Actin - A contractile protein that is part of the thin filaments of muscle fibers, H band - the band at the middle of the A band where only myosin is found, Sarcomere - The smallest contractile unit of muscle; extends from one Z disc to the next, A band - The darkest area that runs the length of myosin, including where actin and myosin overlap, I band - On either side of the A band where only actin is found, Z disk - zig zag zone of protein that divides sarcomeres,

Sarcomere Anatomy Match UP

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