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Human hair color is the pigmentation of human hair follicles and shafts due to two types of melanin: eumelanin and pheomelanin. Generally, the more melanin present, the darker the hair. Its tone depends on the ratio of black or brown eumelanin to yellow or red pheomelanin. Melanin levels can vary over time, causing a person's hair color to ...
Uncombable hair syndrome ( UHS) is a rare structural anomaly of the hair with a variable degree of effect. It is characterized by hair that is silvery, dry, frizzy, wiry, and impossible to comb. [ 4] It was first reported in the early 20th century. [ 5] It typically becomes apparent between the ages of 3 months and 12 years. [ 6]
Lead in the bones, teeth, hair, and nails is bound tightly and not available to other tissues, and is generally thought not to be harmful. [177] In adults, 94% of absorbed lead is deposited in the bones and teeth, but children only store 70% in this manner, a fact which may partially account for the more serious health effects on children. [ 23 ]
An example of the codominant inheritance of some of the four blood groups. Mendelian traits in humans are human traits that are substantially influenced by Mendelian inheritance. Most – if not all – Mendelian traits are also influenced by other genes, the environment, immune responses, and chance. Therefore no trait is purely Mendelian, but ...
A woman with dyed pink hair. Hair coloring, or hair dyeing, is the practice of changing the color of the hair on humans' heads.The main reasons for this are cosmetic: to cover gray or white hair, to alter hair to create a specific look, to change a color to suit preference or to restore the original hair color after it has been discolored by hairdressing processes or sun bleaching.
Hair removal. Anterior view of major and minor (lighter color) body hair growth areas in anatomically typical females and males. Hair removal, also known as epilation or depilation, is the deliberate removal of body hair or head hair . Hair typically grows all over the human body and can vary in thickness and length across human populations.
Discrimination. Discrimination based on hair texture, also known as textureism, is a form of social injustice, where afro-textured hair or coarse hair types, and their associated hair styles, are viewed negatively, often perceived as "unprofessional", "unattractive", or "unclean". [ 1][ 2][ 3] This view can lead, for example, to some school ...
D5 is generally considered safe to use. But if you’re concerned, Jung stresses the importance of having proper ventilation when using everyday hair products that may contain D5. “Wherever you ...