Final answer:
Cellular respiration is an exothermic process where energy stored in glucose is converted into ATP and heat is released.
Step-by-step explanation:
The process of cellular respiration is exothermic. During cellular respiration, glucose is broken down, and the energy stored in its chemical bonds is released. This process includes a series of metabolic reactions that convert biochemical energy from nutrients into adenosine triphosphate (ATP). The release of energy from these reactions also produces heat, thus classifying cellular respiration as an exothermic process. To further illustrate the nature of cellular respiration, it can be compared to the reaction of methane burning: CH4(g) + 2O₂(g) → CO₂(g) + 2H₂O(l) + 213 kcal. The release of kilocalories indicates that energy is being emitted, making it an exothermic reaction as well.