BMS 250 Chapter Notes - Chapter 6: Terminal Hair, Myoepithelial Cell, Apocrine Sweat Gland
Document Summary
Hair color, hair color is a result of the synthesis of melanin in the matrix adjacent to the hair papilla. Variations of color reflect genetically determined differences in the structure of the melanin. Additionally, environmental and hormonal factors may influence the color of the hair. As people age, the production of pigment decreases, and thus hair becomes lighter in color. Gray hair results from the gradual reduction of melanin production within the hair follicle; white hair occurs due to a complete stoppage of melanin production. Hair growth and replacement: anagen phase: is the active phase of growth where living cells of the hair bulb are rapidly growing, dividing, and transforming into hair. It is the longest part of the growth cycle and lasts from about (cid:327)(cid:335) months to as much as (cid:334) years, depending on the genetics of the person.
