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The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and fine vellus hair. Most common interest in hair is focused on hair growth, hair types, and hair care, but hair is also an important biomaterial primarily composed of protein, notably alpha-keratin.
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The two main types of hair are the shorter and thinner "vellus" hairs (peach fuzz) found on the body and the longer and thicker "terminal" hairs. Examples of terminal hairs include the hair on your head, facial hair, eyelashes, eyebrows, pubic hair, chest hair and belly hair.
The three stages of hair growth are the anagen, catagen, and telogen phases. Each strand of hair on the human body is at its own stage of development. Once the cycle is complete, it restarts and a new strand of hair begins to form.
Hair covers almost every surface of the human body. This article gives an overview of the structure of hair. It explains how it grows, what it’s made of, and how it changes.
Human scalp hair is a bio-synthesized material that has a complex internal structure. The adult human hair is around 20–180 µm in width, and generally grows to a length of approximately 90 cm. It consists of many layers including the cuticle , the cortex and the medulla .
The average human has about 100,000 hair follicles on the scalp alone. We’ll explore what hair follicles are and how they grow hair. Anatomy of a follicle. A hair follicle is a...
hair, in mammals, the characteristic threadlike outgrowths of the outer layer of the skin (epidermis) that form an animal’s coat, or pelage. Hair is present in differing degrees on all mammals. On adult whales, elephants, sirenians, and rhinoceroses body hair is limited to scattered bristles.
The human body is covered almost entirely with hair, most of which are tiny, colorless vellus hairs. As mentioned above, the few places devoid of hair include the palms, soles, and mucosal regions of lips and external genitalia.
In humans, hair is thinner and lighter than in primates. Human hair aids in sweating thermoregulation and serves as a sense organ. Hair also protects from the elements, including UV radiation. Additionally, humans have specialized hair, such as eyelash hair and eyebrow hair.