Cellular Respiration is a catabolic pathway (break down of molecules into smaller units) for the production of adenosine triphosphate (ATP). It starts with oxygen and glucose and ends with energy, carbon dioxide, and water(made from the formed hydrogen molecules and water.
It starts with Glucose. Glucose first goes through glycolysis, which splits it into two pyruvate and gives off two ATP and NADH. Then the two the pyruvic acid goes into the mitochondria(in the cytoplasm before)!
The pyruvic acid is then oxidized and made into aceytl CoA. From ther it goes into Kreb's cycle and forms two more ATP as well as 6 NADH and 2 FADH. Electrons then move these molecules to the electron transport chain and the majority of the ATP is made.