What are the reactants of cellular respiration?

Oxygen and glucose

Explanation:

In all cells, respiration occurs in the mitochondria. There are three main stages of respiration  

1.In first stage, sugar or glucose is broken down through the glycolysis process in the presence of oxygen

1.In stage two, the pyruvate molecules are transported into mitochondria where they are converted into 2 carbon molecule

2.In the last stage ATP is produced.  

The chemical reaction is as follows -

C6H12O6 + 6O2 → 6CO2 + 6H2O

Thus, glucose and oxygen are reactants of cellular respiration