The document summarizes the key components of the musculoskeletal system. It describes the three types of muscles - smooth, skeletal, and cardiac - and their functions. It also outlines the main parts of the skeletal system including the axial skeleton (skull, vertebral column, ribs, sternum) and appendicular skeleton (upper and lower extremities, shoulder and pelvic girdles). Bones are composed of compact and spongy bone, and bone cells include osteoblasts, osteocytes, and osteoclasts. Muscles and bones work together through joints to enable locomotion.