Mitochondria help the cells to maintain proper concentration of calcium ions within the compartments of the cell.
Mitochondria vary in number and location according to cell type.
A single mitochondrion is often found in unicellular organisms.
Mitochondria are found in all body cells, with the exception of a few. There are usually multiple mitochondria found in one cell, depending upon the function of that type of cell. Mitochondria are located in the cytoplasm of cells along with other organelles of the cell.