Question

what is the role of mucus in the nasal passage​

Answer 1

Lining the nasal cavity is a mucous membrane rich with blood vessels. Cells in the mucous membrane produce mucus and have tiny hairlike projections (cilia). Usually, the mucus traps incoming dirt particles, which are then moved by the cilia toward the front of the nose or down the throat to be removed from the airway. This action helps clean the air before it goes to the lungs. Sneezing automatically clears the nasal passages in response to irritation, just as coughing clears the lungs.

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Answer 2

Your sinuses produce a liter of mucous each and every day. This mucous moves into the nasal cavity where it is pushed back to the back of the nose and then swallowed. The mucous is there to trap impurities in the air and to keep the skin inside the nose moist and healthy. You are constantly, unconsciously swallowing the mucous and recycling it.