![]() The size of a muscle depends on the function it performs. Bones move when muscles contract, or shorten, across the joint. A skeletal muscle crosses a joint between two bones and is attached to each bone either directly or by means of a tendon or a fibrous sheet or band called a fascia. Skeletal muscles attach to bones of the skeleton and control all voluntary movements. ![]() This illustration shows the bodys complex network of skeletal muscles. Cartilage is flexible connective tissue that provides support to skeletal bones and allows joints to move without rubbing against each other. The long, heavy femur bone in the leg acts as a strong lever for powerful or speedy movement. The short, delicate bones in the wrist and hand enhance dexterity, providing flexibility for small, precise motions. The fused bones of the skull safely encase the brain. The breastbone, for example, is a flat plate of bone that helps to protect the heart and lungs in the chest. The soft core of bone, the bone marrow, is where red blood cells, certain white blood cells, and blood platelets form.Bones come in different shapes and sizes, each adapted to perform specific functions. In addition, the bones of the skeleton store calcium, a mineral essential for the activity of nerve and muscle cells. Skeleton SystemThe human skeleton is a strong, flexible framework of 206 bones that supports the body and protects internal organs. HUMAN ANATOMY AND PHYSIOLOGY(ANATOMI DAN FISIOLOGI MANUSIA)
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