calcium homeostasis pathway PW:0000371 The maintenance of adequate intracellular calcium levels are crucial in order to assure the availability of this important ion and, at the same time prevent against the damage its high concentration can cause. Pumps and exchangers move the calcium ions into organelles or outside the cell, channels of many types allow for its transient flow inside the cell. Calcium transport, which maintains and controls the calcium gradient, and calcium signaling, which the gradient promotes, are inextricably connected in the fabric of calcium homeostasis. pathway metal homeostasis pathway