Cellular respiration primarily takes place in the mitochondria of cells. Often referred to as the "powerhouse" of the cell, mitochondria are responsible for producing adenosine triphosphate (ATP), the energy currency of the cell. This process involves breaking down glucose and other organic molecules in the presence of oxygen to release energy, carbon dioxide, and water. Cellular respiration is vital for cellular function, as ATP provides the energy necessary for various cellular activities, including metabolism, growth, and repair.