too much calcium accumulating in the matrix reduced the mitochondrial membrane potential and/or starts an apoptotic pathway , hence the Na-Ca pump tries to maintain an optimal calcium concentration inside the matrix for physiological purposes (boost the TCA cycle enzymes).
What was the reason of michondrial matrix to take calcium ions if they are again exported out by the Na-Ca pump??
As I understand it, the mitochondria can store calcium (like the ER) to maintain calcium homeostasis in the cell. So it functions as calcium storage.
too much calcium accumulating in the matrix reduced the mitochondrial membrane potential and/or starts an apoptotic pathway , hence the Na-Ca pump tries to maintain an optimal calcium concentration inside the matrix for physiological purposes (boost the TCA cycle enzymes).