Fun fact: Why does hair split?

Having beautiful hair is the dream of many girls, but not everyone can have black and shiny hair. For example, when the hair grows to a certain length, it will split, become dry and frizzy, which looks very uncomfortable. Why is this? Why can't hair not split like sweat hair?

Let’s talk about this issue.

01. Comparison between hair and sweat hair

I draw a little picture

Why is it a dotted line? Because compared to the body hair, the hair is really, really, really long.

The length of sweat hair is usually between 0.5±0.3 , and the length of hair is 50cm for women, which is 100 times longer.

If you come across someone with hair that reaches their hips, you can count on your own, it must be 70, 80, or even 1 meter tall. It would be strange if the nutrients could be transferred to them.

02. Why does hair split?

The reason why hair splits is that the hair is too long and lacks nutrition (the hair five centimeters away from the root is lacking nutrition because the cortex layer absorbs nutrients from the sebaceous glands and cannot deliver them to this place), or due to other chemical treatments such as perming and dyeing.

In other words, the key is that the hair is too long and leads to insufficient nutrition. As for the length of the hair, hehe, haha, haha! I see that many netizens don’t know much about hair. Let me briefly explain:

First, the main component of hair is protein, which does not mean that hair is protein.

Second, hair has a cellular structure.

Therefore, hair can absorb water, essence, and dye. This picture shows the basic components of hair, from bottom to top: hair papilla, hair follicle, hair root, and hair shaft.

The dermal papilla and hair follicle are generally responsible for hair production. The hair root is the real hair. The hair we see is actually the hair shaft.

Hair shaft composition:

What do you think? The structure is far beyond what we thought.

If you are not familiar with this structure, think about how plants absorb water.

In fact, the structure of hair is similar to this.

Therefore, hair also needs nutrition, which is why hair can reflect a person's nutritional status.

As for Wu Zixu's hair turning white overnight, this is most likely the reason.

03. Hair styles vary from nation to nation

By the way, someone has scanned the electron microscope: 1 is Han, 3 is Manchu

1 and 2 are Han people. The hair cuticles are arranged evenly and densely, forming horizontal wavy ripples.

3 and 4 are Manchus. The layers of the hair cuticles are unevenly arranged, with obvious peaks and troughs and large distances between peaks.