Why is the element calcium important? how do human use it? is it essential to life?

1. Calcium plays an important role in muscle contraction. It transmits messages through the nerves and the release of hormones. It is crucial on growing new bone and and maintaining bone strength. 
2. It is used in many ways. It is an ingredient included in many antacids. Doctors also will use calcium to control high levels of magnesium, phosphorus, and potassium in your blood. 
3. It is very important for strength purposes and essential.