We have skin that covers our bodies but when does it stop being skin? Our tongues have skin but do our throats? What about our stomachs, lungs, intestines, and everything on the inside they don’t have skin. So where does it end and become whatever it is?
In: Biology
Also, the epithelium that makes up what you think of as your skin has a large quantity of keratin in it, which makes it harder, less porous, provides a barrier to your external environment. That same keratin makes up your nails and hair. It’s a feature of the epithelium in that location. But really, all linings that face the environment are made up of epithelial cells with different features. Your nasal passages, the lining of your throat, all of your intestines, even the alveoli in your lungs – they all “face” the outside world. (Think of it an a tube into your body and back out…)
“Skin” is just a word for your epithelium that is exposed to air and the radiant energy of the sun.
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