calcium ion

A calcium ion is a calcium atom that has lost two electrons, giving it a positive charge (Ca²⁺). These ions are essential in the body because they play a key role in various functions, including building strong bones and teeth, enabling muscle contractions, transmitting nerve signals, and aiding blood clotting. Calcium ions move around in the bloodstream and cells, where they act as messengers and structural components. Their balance is tightly regulated by the body to keep these vital processes functioning properly.