Ciekawostka: Hair is made from the same substance as fingernails

Evidence: 84 • authority: 72

Baleens or baleen plates are triangular sheets of keratin that make up a filter-feeding system (the "Baleen rack") inside the mouth of baleen whales. The feeding process starts as the animal opens its mouth to take in water. The whale then pushes the water out through a rack of baleen plates, so as to retain (filter) what will serve as food for the whale. A baleen is similar to a bristle and consists of keratin, the same substance found in human fingernails, skin and hair. Some whales, such as the bowhead whale, have baleen of differing lengths. Other whales, such as the gray whale, only use one side of their baleen. These baleen bristles are arranged in plates across the upper jaw of whale…

Evidence: 51 • authority: 80

Review for "Carbon and Nitrogen Isotope Composition of Australasian Hair and Fingernails in a Global Context"

Evidence: 51 • authority: 80

Review for "Carbon and Nitrogen Isotope Composition of Australasian Hair and Fingernails in a Global Context"

Evidence: 51 • authority: 80

Review for "Carbon and Nitrogen Isotope Composition of Australasian Hair and Fingernails in a Global Context"

Evidence: 51 • authority: 80

A Therapeutic Microneedle Patch Made from Hair-Derived Keratin for Promoting Hair Regrowth

Evidence: 51 • authority: 72

A nail is a protective plate characteristically found at the tip of the digits (fingers and toes) of almost all primates (except for marmosets), homologous to the claws in other tetrapod animals. Fingernails and toenails are made of a tough rigid protein called alpha-keratin, a polymer also found in the claws, hooves, and horns of vertebrates.

Evidence: — • authority: 35