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Hair is a protein filament that grows from follicles found in the dermis.Hair is one of the defining characteristics of mammals.The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair.
Scroll through the gallery below to learn more about your hair, and its cool history: More from LittleThings: Hide Tiny Candy Bars In Homemade Brownie Mix For An Easy And Decadent Treat
Constant tension or strain on the hair damages the follicle, impacting the ability for blood flow and nutrients to reach it and can ultimately result in permanent hair loss, Dr. Mirmirani explains.
When hair loss is genetic. Sometimes genetics is at the root of hair loss. Male- or female-pattern baldness, also called androgenetic alopecia, is the most common reason for hair loss. It’s ...
Red hair ranges from light strawberry blond shades to titian, copper, and completely red. Red hair has the highest amounts of pheomelanin, around 67%, and usually low levels of eumelanin. At 1–2% of the west Eurasian population, it is the least common hair color in the world. It is most prominently found in the British Isles and in Udmurtia ...
Humans, horses, orangutans, and lions are among the few species of mammals that may grow their head hair or manes very long. Humans are believed to have lost their fur 2.5–3 million years ago as hominids when transitioning from a forest habitat to the open savanna, as an effect of natural selection, since this development made it possible to run fast and hunt animals close to the equator ...
Hair is a stratified squamous keratinized epithelium made of multi-layered flat cells whose rope-like filaments provide structure and strength to the hair shaft. The protein called keratin makes up hair and stimulates hair growth. Hair follows a specific growth cycle with three distinct and concurrent phases: anagen, catagen, and telogen. Each ...
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