The document discusses several body systems including the integumentary system, muscular system, skeletal system, and nervous system. It provides information on the main components and functions of each system. For the integumentary system it mentions the skin, hair, nails and their protective functions. It then discusses the many muscles in the body, their fiber composition and roles in movement. It notes there are over 200 bones in the skeletal system and describes their protective and supportive functions. Finally, it outlines the central and peripheral divisions of the nervous system and their roles in voluntary and involuntary control of the body.