Support and movement

Abstract

The skeleton of human beings is inside the body. It protects many vital structures like the brain, heart, lungs, the large blood vessels and sense organs of sight, smell and hearing. It forms a rigid framework to which muscles are attached, and therefore allows movement. Many bones of the body act as levers, so that the maximum amount of work is done for the minimum effort. Red and white blood cells are made in the marrow of many bones. Bones contain large quantities of calcium which can be passed into the blood stream if the body requires it.