Air enters the respiratory system of man two ways - through the mouth and nose. Both of these roads come from the back of the mouth, where the soft palate on the principle similar to the revolving door, alternately cuts off the connection to the mouth or the nasal septum.
Nos is the main route through which to get the air into the body, it is specialized for this. Nose and mouth have śluzowatą bedding material that provides wetting of air before reaching the lungs and inside of the nose is covered in addition, soft hair, which are the additional air purifying system, which protects the lungs against the intrusion of irritating them, some pollutants. An additional task of nose and mouth is heating the air before it gets to the lungs.