Respiration consists of two actions, Inhalation and
As the volume of Lungs increases, air pressure drops
creating a vacuum. The air is inhaled in from outside.
As the air is filled in the lungs, the pressure is raised
to atmospheric pressure. This completes the Inhalation
The atmospheric air is inhaled inside the Lungs in
this action, which is called Purak in Yoga. The volume
of Lungs increased due to the following three movements:-
1. The Diaphragm is pushed down..
2. The Ribs are lifted upwards.
3. The Ribs are opened outside as    shutters
of the window.