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Hair is also a musical: see Hair (musical)
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.
The hair of non-human animal species is commonly referred to as fur.
Human hair
Among humans, 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. 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, which exposes less surface area of the body to direct solar radiation, and
subcutaneous sweat glands, which operate best with an absence of hair.
Typically, humans have more hair on the top of the head (perhaps to protect against too much radiation from the head), 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 is
almost certainly adornment, a by-product of natural selection.
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.
The speed of growth is roughly 10 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.
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.
See also: hair removal, facial hair, pubic hair, hirsutism, social role of hair, blonde joke, blond, red hair, hair wax
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