The document summarizes the physiology of the three main types of muscles - skeletal, smooth, and cardiac. It describes their functions, structures, and control mechanisms. Skeletal muscle is striated, multi-nucleated, and contains transverse tubules. It is voluntarily controlled and produces movement. Smooth muscle is involuntarily controlled and produces functions like vasoconstriction and peristalsis. Cardiac muscle contains intercalated disks and is involuntarily controlled to produce heart contractions.