During cellular respiration, particularly during glycolysis (where glucose is converted into pyruvic acid), the main products alongside ATP include:
- NADH (reduced nicotinamide adenine dinucleotide), which is used later in the electron transport chain for more ATP production.
Since the listed options do not include NADH, the most accurate answer among the choices provided is:
heat
This reflects that some energy is released as heat during cellular respiration processes.