Carbon dioxide (CO2): This is the waste product of breaking down glucose and is exhaled from the lungs.

Water (H2O): Water is produced as a byproduct of cellular respiration, and it is a crucial component of various bodily functions.

Energy (ATP): While not strictly a byproduct, ATP is the primary product of cellular respiration. It's the molecule that provides energy for all cellular processes.

Heat: Cellular respiration is not 100% efficient, meaning some energy is lost as heat. This heat contributes to maintaining our body temperature.

In addition to these, small amounts of other byproducts can be produced depending on the specific type of respiration:

* Lactic acid: This is produced during anaerobic respiration (when oxygen is limited).

* Ethanol: Some organisms, such as yeast, produce ethanol as a byproduct of anaerobic respiration.

Therefore, the primary byproducts of respiration are carbon dioxide, water, and energy (ATP), with heat and other compounds produced in smaller amounts.