How Does Hair Know When to Stop Growing?

The video explains the hair growth cycle, which includes the anagen, catagen, and telogen phases. Each hair type has a different growth duration and speed, influenced by genetics and chemical signals. The anagen phase is when hair grows, catagen is a transitional phase, and telogen is the resting phase. Hair growth varies across the body, with scalp hair having a longer anagen phase than body hair. Scientists are still studying how hair knows when to grow and stop.

What is the primary function of keratin in hair formation?

• To provide color to the hair

• To hold the hair strand together

• To stimulate hair growth

• To nourish the hair follicle

During which phase of the hair growth cycle is the blood supply cut off?

• Exogen

• Anagen

• Telogen

• Catagen

What happens to the hair follicle during the telogen phase?

• It grows rapidly

• It remains dormant

• It starts producing new keratinocytes

• It changes color

How long can the anagen phase last for scalp hair?

• 2 to 6 years

• 30 to 45 days

• 1 to 4 months

• 2 to 4 weeks

What is believed to influence the duration of the anagen phase in different hair types?

• Dietary habits

• Chemical growth signals from stem cells

• Environmental factors

• Hair care products