In which phase do hair follicles undergo significant cellular division?

The phase where hair follicles undergo significant cellular division is the Anagen phase. During this growth phase, the hair follicles are actively producing new cells that contribute to the hair shaft, leading to hair growth. The Anagen phase can last for several years, depending on various factors such as genetics, and it represents the period of maximum hair growth and development.

In this stage, the hair follicles are deeply rooted, and a substantial amount of nourishment and energy is being directed toward cell division and hair production. This is in contrast to the other phases, such as Catagen, which is a transitional phase where growth slows and the hair follicle begins to shrink; Telogen, where the hair is in a resting state and not growing; and Late Telogen, which represents the final resting stage before shedding occurs. Each of these other phases does not involve the same level of cellular activity and division as seen in the Anagen phase, confirming its critical role in hair growth.