Answer:
Cellular respiration refers to the sum total of metabolic reactions which are involved in harnessing the chemical energy present in food and convert it into ATP (adenosine triphosphate).
The glucose serves as the substrate which is degraded in the presence of oxygen to yield energy in the form of ATP.
The whole reaction can be summarized as
C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + 36-38 ATP