The energy liberated during respiration is not all in the form of heat but a large part of it is converted into chemical energy in the form of ATP (Adenosine Triphosphate). This energy is utilised by the body cells for a vast variety of activities like:
- Digestion of food.
- Production of enzymes.
- Contraction of muscles for movement.
- Conduction of electrical impulse in a nerve cell.
- Production of new cells by cell division.
- Keeping the body warm in warm-blooded animals.