Nisita Nasal Ointment 20gThe respiratory tract is lined with a mucous membrane, which guarantees full functional ability of the respiratory organs. Glandular cells and so called ciliary hair (cilia) are embedded in the mucous membrane of the upper respiratory tract. The glandular cells produce a liquid (secretion), which warms and moistens the air that is breathed in (approx. 10 000 litre daily) and, at the same time, absorbs dust, dirt, germs etc. The cilia are in constant