Breathing is an automatic process that occurs even in a state of sleep though karma respiratory system is affected by the autonomic nervous system.
According to the site of the respiratory gas exchange can be divided into two types, namely external breathing and deep breathing.
Breathing out is the air exchange occurs between air in the alveoli to the blood in the capillaries, whereas deep breathing is breathing that occurs between the capillary blood with body cells.
Sign discharge air in the lung is influenced by differences in air pressure inside the chest cavity with air pressure outside the body. If the pressure outside the chest cavity bigger then the air will enter. Conversely, if