The inner layer of nasal cavity is coated with epithelial cells that secrete mucus. What is the importance of the secretion?

It helps prevent allergens and infections from invading the nasal cavity and spreading to other body structures, for example the lungs. The mucus secreted by and which lines the mucosa provides a physical barrier against invasion by pathogens (harmful microorganisms)

Explanation:

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during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

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