Hair Guide, Meaning , Facts, Information and Description
- Hair is also a musical: see Hair (musical) and Hair (movie)
Hair is most commonly that outgrowth of the epidermis found in mammals. Hair is a characteristic of all mammals, though in some species hair is absent at certain stages of life. However, hairs are also found on plants, the technical term for which is trichomes (see for further discussion of plant hairs).
Hair serves a number of different functions. It provides insulation from cold weather and, in some species, from particularly hot weather. Because hair is often pigmented, it provides coloration. This might serve to camouflage an individual; in some mammals, the pigmentation changes with the seasons, becoming white during the snowy winter, for example.
In modern Western societies, it is considered manly for men to have hair on their faces, arms, chests and legs, but the hair growing from the top of the head is generally kept short; equally, it is considered womanly for women to have no hair on their bodies, with the exception of pubic hair, but to have a lot of it on the tops of their heads.
The hair of non-human animal species is commonly referred to as fur.
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2 Structure 3 Types of hair 4 Other information 5 External links 6 See also |
Human hair
One theory suggests that nature selected for little body hair as part of a set of adaptations including bipedal locomotion and an upright posture. Bipedal locomotion is extremely inefficient, and many animals can outrun human beings for short periods of time; such animals, however, are inefficient radiators of heat, and cannot run for long periods of time (notable exceptions include most cursorial animals, including savannah fauna). Thus, human hunters must be able to chase animals for long periods of time, and must therefore have an efficient mechanism for radiating body heat. Upright posture exposes less surface area of the body to direct solar radiation, and subcutaneous sweat glands developed, providing such a cooling mechanism. A more recent theory for human hair loss has to do with a possible period of bipedal wading in a salt marsh in the Danakil region of Ethiopia, which occurred in the hominid lineage, between 5 and 7 million years ago. As a wading animal, it was more efficient to develop short body hair and a layer of subcutaneous fat for streamlining and insulation in the aquatic environment; the eccrine sweat glands developed later after the hominids left the water. This is why most hairless mammals are aquatic (dolphins, dugongs, whales), had an aquatic period in their pasts (elephants, rhinoceroses, pigs) or have very short fine fur because of brief periods back out of the water (seals, sea lions). Humans are no exception to this rule of hairlessness through means of a marine transition, see Aquatic Ape Theory.
Typically, humans have more hair on the top of the head, because this region of the body was exposed to solar radiation at all times, even when wading, and also hair where extremities meet the torso, axillary (arm-pit) hair, and pubic hair), on the eyelids and above them (eyebrows). In most societies people shave, style or adorn their hair for aesthetic reasons.
Sometimes, the term body hair is used, to distinguish hair on the body from hair on the head. The difference between body hair and scalp hair (and, in males, chin and moustache hair) is that head hair for practical purposes grows continuously, whereas body hair alternates regular periods of growth and dormancy. During the growth portion of the cycle, body hair follicles are long and bulbous, and the hair advances outward at about a third of a millimeter per day. After three to six months, body hair growth stops (the pubic and axillary areas having the longest growth period). The follicle shrinks and the root of the hair rigidifies. Following a period of dormancy, another growth cycle starts, and eventually a new hair pushes the old one out of the follicle from beneath. Head hair, by comparison, grows to great length, whereas body hair does not. Anthropologists speculate that the functional significance of long head hair may be adornment, a by-product of secondary natural selection once other somatic hair had been lost.
Unlike other animals, human beings often have their hair cut or remove it by shaving or other means.
Structure
Hair is a biological polymer; over 90% of its dry weight is made up of proteins called keratins. Under normal conditions, human hair contains around 10% water, which modifies its mechanical properties considerably. Hair proteins are held together by disulfide bonds, from the amino acid cysteine. These links are very robust; for example, virtually intact hair has been recovered from ancient Egyptian tombs. Different parts of the hair have different cysteine levels, leading to harder or softer material.
Structurally, hair consists of an inner cortex, comprising spindle-shaped cells, and an outer sheath, called the cuticle. Within each cortical cell are many fibrils, running parallel to the fibre axis, and between the fibrils is a softer material called the matrix. It grows from a hair follicle.
The cuticle is responsible for much of the mechanical strength of the hair fibre. It consists of scale-shaped layers. Human hair typically has 6-8 layers of cuticle. Wool has only one, and other animal hair may have many more layers. Hair responds to its environment, and to its mechanical and chemical history. For example, hair which is wetted, styled and then dried, acquires a temporary 'set', which can hold it in style. This style is lost when the hair gets wet again. For more permanent styling, chemical treatments (perms) break and re-form the disulphide links within the hair structure.
The diameter of a human hair ranges from about 18 µm to 180 µm. In people of European descent, blond hair and black hair are at the thinner end of the scale, while red hair is the thickest. The hair of people of African descent is typically thicker than the hair of other groups.
Some persons of African descent have hair that if left alone will grow in tight curls and develop into a unique hairstyle known as the afro; since the development of the concept of Black Power, there has been a debate as to whether such persons should use products that straighten their hair.
The speed of growth is roughly 11 cm/yr = 0.3 mm/day = 3 nm/s. The cells at the base of the hair follicle divide and grow extremely rapidly. This is why people under chemotherapy sometimes lose their hair; the treatment targets any rapidly-dividing cell, not just the cancerous ones.
Hair is strong. A single strand can hold 100g (3.5oz) on weight. A head of hair could support 12 tonnes. It is equivalent in strength to aluminium or Kevlar.
Types of hair
On most adult humans there are two main types of hair: terminal hair, and vellus hair. A third type, lanugo hair, is present in the fetus, and some newborn babies.
Terminal hair grows thick and long, and is what grows on the head, armpits and pubic area, as well as on the face, chest, arms and legs (better evident in men).
Vellus hair is a very soft and short hair that grows most places in the body in both sexes. In caucasians it is often colourless, or blonde. It is best seen in women and children, as they have less terminal hair to obscure it.
It is commonly claimed that hair and nails will continue growing for several days after death. This is a myth; the appearance of growth is actually caused by the retraction of skin as the surrounding tissue dehydrates, making nails and hair more prominent.
This is an Article on Hair. Page Contains Information, Facts Details or Explanation Guide About Hair Other information
Notable variations in physical appearance of the top and back of the head are:
Hair spray, gel, etc. may be used for fixation of the arrangement and may also make it shiny.External links
See also
facial hair, pubic hair, hirsutism, baldness, hair removal, social role of hair, blond, blonde jokes, red hair