Calcium has a vital and indispensable role in the human body and without calcium ions, human beings would have difficulty surviving. First of all, calcium ions are involved in muscle contraction as well as nerve regulation, and play an important role in conduction during nerve expression. Without calcium ions, it means that muscles would no longer be able to contract and nerve conduction would no longer be conveyed. Second, calcium ions are also important clotting factors, involved in the clotting process. Without calcium ions, it means that once bleeding is stopped, it will be difficult to stop, and you may eventually die from blood loss. Finally, calcium ions are also an important constituent of human bones, without calcium ions deposited on the bone, there is no scaffolding role for the bones, and humans cannot walk.