hair structure and function

Hair is made of a protein called keratin, formed within hair follicles beneath the skin. Each hair has a visible shaft, a root embedded in the skin, and a follicle that supplies nutrients. Hair serves various roles: providing insulation, protecting the scalp from sun damage, and enhancing sensory perception through hair follicles that detect stimuli. It also plays a part in social identity and appearance. The growth cycle involves phases of growth (anagen), rest (telogen), and shedding, influenced by factors like age, health, and genetics.