Human Hair

Human Hair

Human hair refers to the filamentous biomaterial that grows from the follicles found on the scalp and other parts of the human body. It is composed mainly of keratin, a fibrous protein that is also found in nails and the outer layer of skin. The color, texture, and length of human hair vary widely among individuals and are determined by genetic factors. Hair serves various functions, including protection from the sun, insulation, and sensory perception. Human hair can be classified into three main types: straight, wavy, and curly. Straight hair is the most common type and is characterized by a smooth, sleek appearance. Wavy hair has a slight curl or wave pattern, while curly hair has a more pronounced curl pattern. The texture of human hair can also be classified as fine, medium, or coarse, depending on the diameter of the individual strands. Hair growth occurs in three phases: anagen, catagen, and telogen. During the anagen phase, which lasts for several years, the hair follicle actively produces hair. The catagen phase is a transitional phase that lasts for a few weeks, during which the hair follicle shrinks and the hair stops growing. Finally, during the telogen phase, which lasts for several months, the hair falls out and the hair follicle enters a resting phase before starting the cycle again. Human hair has been used for various purposes throughout history, including as a decorative element, for religious or cultural purposes, and as a symbol of social status. Today, human hair is used primarily for the production of wigs, hair extensions, and other hair products.

keratin, anagen, catagen, telogen, hair follicle

— Matthew Thompson