Especially a lot of mitochondria in cells?

Because this organoid is the main supplier of energy, respectively, most of it is in cells that consume this energy in large quantities. For example, cells in muscle tissue, heart, liver or brain. For example, muscle contraction can occur only when a number of proteins and ATP interact. The metabolic balance of liver cells is directly related to the number and quality of mitochondrial function. In the cells of any tissue, the number of mitochondria depends on the degree of demand; in the case of an increase in the consumption of ATP by the cells, the number of organelles increases, and vice versa.