Answer
Each follicle goes through growth cycles. In the regressive phase, the hair matrix cells die and the follicle base and hair bulb shrivel somewhat, dragging the hair papilla upward to abut the region of the follicle that does not regress. The follicle enters a resting phase for one to three months. The cycling part of the follicle regenerates and the matrix proliferates again and forms a new hair to replace the old one that has fallen out or will be pushed out by the new hair.
Factors that affect growth cycles include nutrition, hormones, local dermal blood flow, body region, gender, age, genetic factors, physical/emotional trauma, excessive radiation, and certain drugs.
Factors that affect hair texture include hormones, body region, genetic factors, and age.
Work Step by Step
Each follicle goes through growth cycles. In the regressive phase, the hair matrix cells die and the follicle base and hair bulb shrivel somewhat, dragging the hair papilla upward to abut the region of the follicle that does not regress. The follicle enters a resting phase for one to three months. The cycling part of the follicle regenerates and the matrix proliferates again and forms a new hair to replace the old one that has fallen out or will be pushed out by the new hair.
Factors that affect growth cycles include nutrition, hormones, local dermal blood flow, body region, gender, age, genetic factors, physical/emotional trauma, excessive radiation, and certain drugs.
Factors that affect hair texture include hormones, body region, genetic factors, and age.
