calciaum as the element is a grey silvery metal. calcium's a chemical symbol is "Ca",atomic number 20 and the 5th most abundant element in the earth's crust. It is a chemical element which is essential for living organisms, including humans. Calcium is a mineral found in many foods. The body need calcium to maintain strong bones and to carry out important functions. Almost all calcium is stored in bones and teeth,where it supports their structure and hardness. The body also need calcium for muscles to move nad for nerves to carry messages between the brain and every body part. In addition , calciun is used to help blood vessels move blood throughout the body and to help release hormones and enzymes that effect almost every function in the human body.