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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.

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.

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.

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    Organic products for weight loss, hair growth, and to stop smoking.
  • Regaine Solutions
    Explains the process of hair growth and hereditary hair loss and offers a minoxidil based hair loss treatment for both men and women.
  • California Pacific Research, Inc.
    New Generation hair care systems to promote healthy hair growth without drugs and potential side effects.
  • NuGen Hair Growth System
    Natural hair regrowth systems for men and women.
  • MoreHair.com
    Comprehensive, up-to-date information about hair growth, hair loss, and various treatment options. Factual articles on the follicle, the growth cycle, and genetics.