The primary energy factory of a cell is the mitochondrion. Mitochondria are responsible for producing adenosine triphosphate (ATP), the energy currency of the cell, through a process called cellular respiration. This organelle converts nutrients from food into ATP using oxygen. Mitochondria also play integral roles in metabolic pathways and the regulation of cellular metabolism. Their efficiency is vital for supplying energy necessary for various cellular functions, including movement, growth, and maintenance.