Natural Calm
You experience the tensing (calcium) and relaxing (magnesium) interaction of these two elements each time your heart beats, when you feel your pulse, and every time you breathe. When we are under stress, our cells—which in their resting state contain magnesium—go through a change.
Calcium, normally outside the cells, enters the cells and the calcium level becomes high. This is the action state in which a muscle cell, for example, will contract and tense the muscle. The magnesium then pushes the calcium out of the cell and the cell is again in its resting, relaxed state. Think of it as an on-off switch. The “off” is magnesium and the “on” is calcium.