Any process involved in the maintenance of an internal steady state of calcium ions within the cytoplasm of a cell or between mitochondria and their surroundings.
regulation of cytosolic calcium ion concentration +
calcium ion homeostasis in mitochondria
;
calcium ion homeostasis in mitochondrion
;
mitochondrial calcium ion concentration regulation
;
regulation of calcium ion concentration in mitochondria
;
regulation of calcium ion concentration in mitochondrion
;
regulation of mitochondrial calcium ion concentration