what is hair
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hair A hair is a thin, flexible shaft of cornified cells that develops from a cylindrical invagination of the epidermis, the hair follicle. Each consists of a free portion or shaft (scapus pili) and a root (radix pili) embedded within the follicle.
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Hair Growth - Hair Construction Hair Growth-Hair Construction Q: What exactly is hair made of and how does it grow? A: The best way to answer this question is to reverse the two parts. First, your hair grows from follicles within the skin. The part of the hair inside the follicle (below the skin's surface) is known as the hair root, while the portion you see protruding from the head is the hair shaft. At the base of the hair root is the hair bulb where nutrients are received and new cells are formed.
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Cuticle (hair) The hair cuticle is the outermost part of the hair shaft. It is formed from dead cells, overlapping in layers, which form scales that gives the hair shaft strength and provide protection for it. Although the cuticle is the outermost layer of the hair, it does not give the hair its color because it has no melanin, which is the pigment responsible; the color of a person's hair depends on what type of melanin they have, which is found in the cortex. References
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- Traditional, mint-flavored Mentos also contain 10 calories per piece. Each piece contains about 2.64 grams of carbohydrates, 2 grams of sugar, 0.01 gram of saturated fat and about 1 milligram of sodium.
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hair Definition of hair for Students. 1  1 : a threadlike growth from the skin of a person or animal She pulled out a hair. 2  2 : a covering or growth of hairs I got my hair cut. 3  3 : something (as a growth on a leaf) like an animal hair.  4 : a very small distance or amount I won by a hair.
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Overview Hirsutism. Hirsutism (HUR-soot-iz-um) is a condition of unwanted, male-pattern hair growth in women. Hirsutism results in excessive amounts of stiff and pigmented hair on body areas where men typically grow hair — face, chest and back.The amount of body hair you have is largely determined by your genetic makeup.Hirsutism may arise from excess male hormones called androgens, primarily testosterone.irsutism results in excessive amounts of stiff and pigmented hair on body areas where men typically grow hair — face, chest and back. The amount of body hair you have is largely determined by your genetic makeup. Hirsutism may arise from excess male hormones called androgens, primarily testosterone.
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Hair Loss: The Science of Hair At the base of the follicle is the papilla, which contains capillaries, or tiny blood vessels that nourish the cells. The living part of the hair is the very bottom part surrounding the papilla, called the bulb. The cells of the bulb divide every 23 to 72 hours, remarkably faster than any other cell in the body.
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Beard For other uses, see Beard (disambiguation). A beard is the collection of hair that grows on the chin and cheeks of humans and some non-human animals. In humans, usually only pubescent or adult males are able to grow beards. From an evolutionary viewpoint the beard is a part of the broader category of androgenic hair.
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Hair follicle Hair follicle. A hair follicle is a part of the skin, which grows a hair by packing old cells together. Attached inside the top of the follicle are sebaceous glands, which are tiny sebum-producing glands in almost all skin except on the palms, lips and soles of the feet. The thicker the hair, the more the number of sebaceous glands there are.
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human bodyList of Common Diseases: Most Common Illnesses Hair loss, also known as alopecia or baldness, is a loss of hair from the head or body. Baldness can refer to general hair loss or male pattern hair loss.Some types of hair loss can be caused by alopecia areata, an autoimmune disorder.air loss, also known as alopecia or baldness, is a loss of hair from the head or body. Baldness can refer to general hair loss or male pattern hair loss.
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Hair But there's hair on almost every part of your body. (Places that don't have hair include the lips, the palms of the hands, and the soles of the feet.) Some of the hair on your body is easy to see, like your eyebrows and the hair on your head, arms, and legs. But other hair, like that on your cheek, is almost invisible. Depending on where it is, hair has different jobs. The hair on your head keeps your head warm and provides a little cushioning for your skull.
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Hair The word hair usually refers to two distinct structures: 1  the part beneath the skin, called the hair follicle, or, when pulled from the skin, the bulb. 2  the shaft, which is the hard filamentous part that extends above the skin surface.air growth begins inside the hair follicle. The only living portion of the hair is found in the follicle. The hair that is visible is the hair shaft, which exhibits no biochemical activity and is considered dead.
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- Hair is one of the characteristics of a mammal that is unique to mammals—no other animals have true hair and all mammals have hair covering at least part of their body at some time during their life.An individual hair consists of a rod of cells that are reinforced by a protein known as keratin.air is one of the characteristics of a mammal that is unique to mammals—no other animals have true hair and all mammals have hair covering at least part of their body at some time during their life.
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Nasal hair Nasal hair. Nasal hair. Nasal hair or nose hair is the hair in the nose. Adult humans have hair in the interior nasal passage. Nasal hair functions include filtering foreign particles from entering the nasal cavity and collecting moisture.
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hair Hair can be a countable noun or an uncountable noun. 1. used as a countable noun. Each of the thread-like things growing on your head and body is a hair. You can refer to several of these things as hairs. These tiny needles are far thinner than a human hair. There were black hairs on the back of his hands.
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What is hair made of? Hair is made out of keratin. It's a type of protein for your head. Also made of natural oils and water. Hair is made of dead skin cells. When they die they come out of your head. Interesting fact: Your hair is made of the same thing as your nails. Your fingernails and toenails.
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What is the function of hair? The reasons we have hair are not completely understood. We do know that hair, along with skin pigmentation, is the primary natural protector we have against the sun’s ultra-violet rays. The hair on your head helps prevent trauma to the skull. Heck, it can even save your life! Hair also helps to insulate and conceal.
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hair cell hair cell. n. A cell with hairlike processes, especially one of the sensory epithelial cells present in the organ of Corti. n. an epithelial cell having hairlike processes, as that of the organ of Corti.
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- hair·style. n. A style in which the hair is cut and arranged. hair′styl′ing n.
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âWhat Is My Hair Type?â: Hair Texture Hair texture is the thickness of your hair strand. Your hair texture can be fine, medium or coarse(thick). People often confuse hair texture (or thickness of hair strand) with density of hair. Hair texture refers to the diameter of the actual hair strand, while density refers to how many strands are on your head.
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- An ingrown hair is a hair that has grown into the skin rather than out of the skin as it would naturally. This occurs after shaving or waxing. The skin curls during regrowth and grows back into the skin.
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- All hair is not the same; hair is a manifestation of human diversity. In this article, 'hair care' is taken to mean care of hair on the human head, but mention may be made of processes and services which impact hair on other parts of the body.
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Overview of Hair Biology, Structure, and Function Hair Follicle. The hair follicle is the living part of the hair. It's a stocking-like structure that contains cells and connective tissue. The papilla exists at the very base of the hair follicle. It contains tiny blood vessels - capillaries - that nourish the cells.
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What is hair made of? Hair is primarily made of a special type of protein called keratin.. Keratin is the same tough, water insoluble material that fingernails and animal horns and hooves are made … of. Hair also contains natural oils (lipids) and water.
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hair Hair in each part of the body has a definite period of growth, after which it is shed. In the adult human there is a constant gradual loss and replacement of hair. Hair of the eyebrows lasts only 3 to 5 months; that of the scalp 2 to 5 years.
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10 Causes of Hair Loss Depending on the style and era, hair is used to allure or express power and beauty, virility, or status. Plays, books, and movies have been penned about it, and scientists study it like the plague. Whatever your relationship to your hair, it is an indomitable force of self-consciousness and social distraction.