The muscular system enables movement, maintains posture, supports organs, regulates temperature, and controls voluntary/involuntary actions like breathing and digestion.
Muscles exhibit excitability, contractibility, extensibility, elasticity, and adaptability, responding to nervous stimuli, stretching, and adapting to different conditions.
Muscles consist of elongated cells called muscle fibers bundled together into fascicles, with myofibrils containing proteins like actin and myosin essential for contraction.
Smooth muscles (involuntary, found in organs), cardiac muscles (involuntary, in the heart), and skeletal muscles (voluntary, attached to bones) each serve distinct roles in the body.
Tendons connect muscles to bones, fascia connects muscles to each other, and the nervous system controls skeletal muscles to facilitate movement; damage leads to paralysis.
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