Why Do Humans Have Fingernails And Toenails?
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- เผยแพร่เมื่อ 29 ส.ค. 2024
- Human fingernails are actually flattened versions of claws. All primates, including ancient ancestors of humans, had claws that supported their broad fingertips. The broad fingertips helped primates maintain a strong grip around objects, including trunks and tree branches.
Humans are distinct from other animals in many ways-cognitive capacity, hairlessness, and our opposable thumb-but having nails isn’t one of them. Our ancestors, primates, also have finger and toenails that look like ours. In fact, mammals, birds and reptiles have similar features at the ends of their appendages, such as claws and talons.
These nails or claws or talons are made of a protein called keratin. This is the same protein that makes up your hair, the horns on cows and sheep, and the hooves of horses, zebras, bulls, and other ungulates.
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I'm kinda fascinated by the idea of the fingernails providing a counter-pressure to the fingertip. I feel like we take that for granted. Hard to imagine what it would feel like to use your fingers without fingernails.
Toenails are good and all until you get an ingrown
High quality video! Thank you. Very underrated.
You see I feel like this is all speculation because I think I could strike rocks together with or without fingernails
Very clear explanation about the development of fingernails and toenails from much earlier ancestors. And why they help grip things more firmly and provide protection for our digits. Thank you ☺
2:23 THAT IS SO FREAKING ADORABLE!!! 😂
very informational
Makes lots of sense, but 50 million years ago really that's why there's still monkeys on the planet what baffles me is what humans did the passed 200 years alone from electricity cars planes etc...... But we been here millions of years . Lol 😂