Where are goblet cells typically found and what is their main function?

Goblet cells are specialized epithelial cells primarily located in the epithelial lining of the respiratory and gastrointestinal tracts. Their main function is to secrete mucus, which plays a crucial role in maintaining the health and function of mucous membranes. Mucus serves several purposes: it acts as a lubricant, helps protect epithelial cells from mechanical damage, traps pathogens and particulate matter, and plays a part in the immune response by containing antimicrobial properties.

The presence of goblet cells in various epithelial tissues is significant for the protection and moisture of these membranes, facilitating functions such as the movement of materials through the intestines and trapping dust and microbes in the respiratory system. This mucus secretion is vital for ensuring that the underlying tissues remain hydrated and protected against harmful substances and pathogens.