Why are eyelashes, eyebrows not growing as long as hair?

Many people, especially those living in urban areas, often spend a considerable amount of time caring and trimming hair. Why not? Hair on the head of each person (except bald) continues to grow and must be cut / trimmed every 2-3 months. What about hair on eyelashes and eyebrows? Do you remember ever pruning eyelashes? Sure is not.

How can the hair on our eyebrows and eyelashes grow as fast as hair on other parts of the body?

Before getting to the bottom of the mystery of hair, we should know about hair growth in general, according to ScienceABC's synthesis.

Hair grows in humans

In addition to a few parts of the body, hair is present on the whole person. This is very good news for us because depending on the area of ​​the body, hair plays an important role in regulating body temperature, such as maintaining a stable body temperature (cool in summer, keeping warm in winter).

Prehistoric hair of prehistoric people helps them to be safe in extreme weather conditions. In ancient times, when woolen clothes and blankets were not ordinary goods, the ones that kept the body warm were hair.

The hair in these areas is long, only it doesn't last as long as the hair on the head.

Growth cycle of hair follicles

Hair follicles are present in the skin that is responsible for producing and lengthening hair. Hair production occurs in three main stages, eliminating the formation of specific hair follicles (also known as morphological cysts) :

Anagen stage

This is a positive growth phase of hair follicles. During this period, the hairline divides rapidly and the length of the hair shaft grows at a rate of about 1cm every 28 days. This is the most important stage. By the end of this period, the hair follicles will automatically enter the next stage .

Catagen stage

This is a transitional phase that marks the end of hair growth and cuts off the blood supply to the hair fibers. This stage lasts for 2-3 weeks and then the hair stops growing, the outer membrane of the hairline shrinks and sticks to the hairline, called the formation of "club hair".

Phase Telogen

After going through the two stages mentioned above, this is the last stage of hair rest. When pulling out a strand of hair in telogen phase, you will see a dry white substance at the hairline. Normally, about 25 to 100 hairs fall in telogen phase. During this period, the hair begins to fall.

Why do eyelashes and eyebrows stop long?

Many people think that hair is in the eyebrows, eyelashes do not grow at all, that they remain the same from birth to death. However, that is not true. The hair in these areas is long, only it doesn't last as long as the hair on the head.

Because we specifically talk about "long hair out" in eyelashes and eyebrows, the anagen phase provides the best explanation. Although every hair on our body spreads through the anagen phase, the time it takes for each hair depends on where it grows.

While the hair on the head is usually 2 to 7 years old (depending on different genetic factors), the hair on the eyebrows and eyelashes is only 30 days at this stage. Therefore, they don't have much time to be long and become as long as hair on the head.

If your eyelashes and eyebrows also undergo a longer anagen period, lest your eyelashes and eyebrows will be much longer than they are now and you will probably be very upset if eyebrows and eyelashes too long right?