what happens during respiration ??
Respiration is a complicate process which includes breathing and oxidation of food with the release of energy. Breathing means taking in air rich in oxygen and giving out air rich in carbon di oxide.
All living organisms respire to get energy. The energy produced during respiration is in the form heat.
During respiration organisms get oxygen from the environment through specialized organs of breathing called lungs which are present in higher animals from frog to man. The release of energy takes place with the help of enzyme catalyzed chemical reactions. These reactions are known as cellular respiration which takes place in all living organisms.