Thursday, 20 April 2017

The structure and composition of human nails

A nail is a horn-like envelope covering the tips of the fingers and toes in most primates and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protective protein called keratin. This protein is also found in the hooves and horns of different animals. Nails start in the nail root, hidden under the cuticle. When cells at the root of the nail grow, the new nail cells push out the old nail cells. These old cells flatten and harden, thanks to keratin, a protein made by these cells. The newly formed nail then slides along the nail bed, the flat surface under your nails. Fingernails and toenails are made of keratin - a protein made of dead cells, which is also the main protein found in hair. In fact, structurally nails are modified hair. Cutting your hair and fingernails doesn't hurt because they are dead - makes sense right. Horse hooves and bird feathers are also made of keratin. fingernails grow about one-tenth of an inch (3 millimeters) a month. If you lose a fingernail, it will take four to six months to regrow completely. Toenails take a year to a year and a half to grow from cuticle to tip.

Information from:
https://www.popsugar.com/fitness/5-Things-About-Your-Nails-401331
https://en.wikipedia.org/wiki/Nail_(anatomy)
https://kidshealth.org/en/kids/your-nails.html
http://health.howstuffworks.com/skin-care/nail-care/health/how-fast-do-nails-grow.htm

Image from: https://en.wikipedia.org/wiki/Nail_(anatomy)#/media/File:Blausen_0406_FingerNailAnatomy.png

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