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
Those body regions are also composed of epithelial cells.
There are four main categories of human tissue:
Muscle- muscle ‘stuff’
Nervous – nerves and brain, signaling ‘stuff
Connective- bones, cartilage, things that hold you together. Fibrous ‘stuff’
And epithelial tissue. Barriers and membranes.
Although, once you’re inside the body, we tend to call them endothelial cells.
Anything that contacts the environment, like the things you listed, is in that category.
Also, membranes around body cavities and the interior surface of blood vessels.
Also also, body structures that produce things for you like glands.
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