The energy required for the continuation of animals' lives is formed as a result of reactions and reactions. The respiratory system consists of the lungs and the pipe system that carries the necessary air to the lungs. The lungs are the basis of this system. From the lungs, air is transported to the bronchi and bronchioles. It passes from the bronchioles to the alveoli. The air given to the blood from the alveoli is carried to the cells from there. Cells obtain energy by using this oxygen. Carbon dioxide comes back to the alveoli through the blood. Carbon dioxide circulating in the capillaries of the alveoli is exhaled through the bronchioles, bronchi, trachea, larynx, pharynx, mouth and nose.