the.com/mucosa
the body's slick inner wallpaper, defending you while pretending to do nothing
means The moist membrane lining the inner surfaces of organs and cavities that open to the outside world — like the nose, mouth, gut, and airways — which secretes protective mucus.
from Straight from Latin mucosa, the feminine form of mucosus, "slimy, mucous," itself from mucus, "slime, nasal discharge." That mucus traces back to a root meaning something like "to slip" or "slimy thing," likely a cousin of Greek myxa (mucus, and also the nozzle of a lamp). The full anatomical term is membrana mucosa, "mucous membrane" — medical Latin simply dropped the membrana and let the slime stand alone.
- surface area
- gut lining spans roughly a tennis court
- daily output
- produces over a liter of protective mucus
- fast turnover
- gut lining replaces itself every few days
- immune front
- hosts most of the body's immune cells
- everywhere
- lines mouth, nose, lungs, gut, and more
oral mucosa — lines the mouth and contains ~10,000 taste buds in humans
intestinal mucosa — covers small intestine with villi that increase surface area ~600 times for nutrient absorption
respiratory mucosa — lines airways from nose to bronchioles and traps particles with mucus in humans