GENERAL HISTOLOGY

Detailed explanation-1: -The classical roles of respiratory mucus are to maintain the hydration of the respiratory tract and to act as a protective barrier against the external environment by trapping particulate matter, including pathogens.

Detailed explanation-2: -Mucus removal is aided by the coordinated beating of tiny hairlike projections (cilia) that line the airways. The cilia sweep the mucus up the airways, away from the lungs., and intestinal secretions. These substances can kill bacteria or prevent them from multiplying.

Detailed explanation-3: -Mucus secretion by goblet cells mediates delivery of intestinal material to dendritic cells. Goblet cells and their produced mucus is part of our innate immunity and intimately linked to the adaptive immune system.

Detailed explanation-4: -Mixed with water, mucins link up to form a gluey gel. That gel traps bacteria, viruses, dirt and dust in its sticky embrace. In fact, mucus is the lung’s first line of defense against germs, which explains why the lung makes so much of it.