Hair is made up of dead cells stacked on top of one another. The outside layer of the hair, called the dermic layer, is made of flat, saucer-shaped cells. The stacking of these varies between animals.
If you were to look at a dog hair and a cat hair under an electron microscope, the dog hair would look almost flat, since the dermic cells are attached at their edges, like this:
The cat hair would be very bumpy, as the dermic cells on it are attached on their sides, like this:
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It's these spaces between the cells on the cat hair that let it hang onto surfaces better than dog hair. The surface of human hair is somewhere between the two, with cells that stick up like cat hair and others that are flat like dog hair.
Posted 4169 day ago