Across all three energy pathways energy is produced in form...

Glycolysis and the citric acid cycle break down glucose molecules into products, storing the energy as ATP, CO2, NADH, and FADH2. Pyruvate is converted to lactic acid or acetyl-CoA. Upon completion of glycolysis and the citric acid cycle, only a small portion of the energy is converted to ATP. At this point, the majority of the usable glucose has been contained in electron carriers NADH and FADH2. The byproducts of cellular respiration are carbon dioxide and water. The major production of ATP during aerobic metabolism occurs when electrons from NADH and FADH2 are transferred to oxygen, the final electron acceptor. NADH synthase uses this transfer to produce ATP. The direct energy source for the breakdown of glucose is the conversion of glucose to pyruvate, producing CO2 and H2O. The energy from the breakdown of NADH and FADH2 is derived from the established H+ gradient in the mitochondria. Energy from the metabolism of amino acids also contributes to ATP production.

Krishna G.