NGSS HS-LS1-7: Use a model to illustrate that cellular respiration is a chemical process whereby the bonds of food molecules and oxygen molecules are broken and the bonds in new compounds are formed resulting in a net transfer of energy.
Notice that the exact same number of atoms exist before and after the reaction. The atoms are simply rearranged into new compounds.
Aerobic Respiration: When Oxygen is present, 1 Glucose molecule combines with 6 Oxygen molecules to produce ~36 ATP, Carbon Dioxide, and Water.
Anaerobic Respiration: If Oxygen is depleted, cells use anaerobic pathways (like fermentation), which produces only ~2 ATP and Lactic Acid. Try lowering the Oxygen slider to see this effect!