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The mucous membrane of the nasal cavity is the opening part of the respiratory tract which has a number of functions among which protection is the most important. Once in the nasal cavity, the inhaled air is mechanically cleaned of dust pollutants, humidified and warmed. About 10 thousand litres of air pass through the nose during a day. The nasal mucosa also hinders penetration of pathogens (bacteria, fungi, viruses) into the lungs.