In health care, ATP stands for adenosine triphosphate and ATP synthase is the enzyme that is responsible for creating ATP. Energy is the key thing about ATP. Oxidative phosphorylation plays a part in this in which the enzymes are used by the cells to provide oxygen in order to produce the energy for ATP. There is a direct energy source for ATP because ATP can produce its own energy, but it needs something else.
The inner mitochondrial membrane that acts as the direct energy source that drives the ATP synthesis during the respiratory oxidative phosphorylation. This happens when there is a difference in H+ concentrations on opposite sides of the inner mitochondrial membrane. When this is done directly, energy is supplied or created.