The skin and mucous membranes covering the body or lining its openings offer considerable resistance to invasion by bacteria and other infectious organisms.
When the stomach is empty, the mucous membranes lining its walls are highly folded; buried within these folds, or rugae, are numerous digestive glands.
The larynx is also called the voice box because it contains the vocal cords, which are two folds of mucous membrane that can open and close like curtains.
That's why they say to try and never touch your face, since the mucous membranes of your eyes, nose, and mouth act like shuttles to the hitchhiking germ.
Occasionally in the sputum there might be curschmann spirals, which are spiral shaped mucus plugs or basically elongated mucous casts from small bronchi of people with bronchial asthma.
When we breathe, air enters our nose and passes through four chambers called sinuses where the air gets warmed up, humidified, and filtered by mucous membranes.
And the inner mucosa is made up almost entirely of mucous cells, which produce a protective coat that keeps the stomach tissues from getting digested along with your lunch.
The facial nerve also innervates the sublingual and submandibular glands, which secrete saliva, as well as the lacrimal gland which produces tears, and mucous membranes of the nose, mouth, and nasopharynx.