Function of the Skeleton
The primary function of the skeleton is to provide a framework for the tissues of your body, much like a building's inner, steel framework. The skeleton is also designed to protect the internal organs including the heart, lungs, and brain. Besides support and protection, the skeleton is designed for efficient movement.
Joints allow for this movement, and muscles that move the skeleton need firm points of attachment to pull against so they can work efficiently. Bones are also responsible for producing blood cells. Red marrow-found in the humerus, femur, sternum, ribs, vertebrae, and pelvis-produces red blood cells, some white blood cells, and cell fragments that are involved in blood clotting.
Yellow marrow, found in many other bones, stores fats and aids in producing red blood cells when there is a massive blood loss due to sever injury. Finally, the bones of the skeleton serve as storehouses for minerals, including calcium and phosphorus. Calcium is a critical part of the diet for healthy, strong bones. Calcium is also important for transmission of nerve impulses and muscle contraction. However, most of these minerals are used during growth and formation of skeleton.