Information on Hair Healthcare professionals and scientists have carefully prepared this ALtruis Biomedical Network-affiliated site, intended for informational purposes only . In different parts of the body, hair varies both structurally and biologically. For example, scalp hair is different than the fine, downy, vellus hair found on the face of females or young people.
Hair also varies in shape, length, rate of growth, and response to stimuli.
Factors such as light, hormones , temperature, and nutrition affect the rate of hair growth and the strength of the hair. The lengths of the phases in the hair life cycle also vary in different parts of the body. For example, scalp hair has the longest growth phase, and grows about 0.35 mm each day. Hair Color Melanocytes are pigment-producing cells. They are located throughout the body, and give skin including freckles and age spots and hair their color.