Explain the process of breathing in man.
Breathing involves two step, viz. inhalation and exhalation.
Inhalation: The process of taking in air called inhalation. During this process, ribs come out and diaphragm moves down. This increases the volume inside the lungs and reduces the pressure in lungs. As a result, air moves towards the lungs.
Exhalation: The process of giving out air is called exhalation. During this process, ribs go in and diaphragm moves up. This reduces the volume inside the lungs and increases the pressure in lungs. As a result, air moves out of the lungs.
