Sarcomere

- is the contractile unit of the myocardial cell.

- is similar to the contractile unit in skeletal muscle.

- contains thick filaments (myosin) and thin filaments (actin, troponin, tropomyosin).

- As in skeletal muscle, shortening occurs according to a sliding filament model, which states that thin filaments slide along adjacent thick filaments by forming and breaking cross-bridges between actin and myosin.

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