How does a pore grow to have a lot of hair to return a responsibility

summary

My wife's hair is long and looks very beautiful. Many people admire her very much. Long hair has both advantages and disadvantages. It takes a long time to wash her hair every time. I always wonder why people keep growing their hair. If it's the problem of animal evolution, the hair on the body has gradually degenerated or nearly disappeared in the process of evolution from monkey to human, but the growth of hair has been continuously strengthened, which belongs to the type of "endless wildfire and spring breeze". Let's take a look at the following.

How does a pore grow to have a lot of hair to return a responsibility

First: hair is really a special substance. It's an appendage of the skin, made up of keratin filled cells. Keratin is also found in harder tissues like fingernails and toenails. Hair usually grows in any part of the body except the palm, sole of the foot, lips and nipples. Each hair is fixed in tiny follicles under the skin. The shape of hair follicles affects the shape of hair.

Second: round hair follicles grow straight hair, oval hair follicles grow wavy, and those with curly hair follicles are spiral. The hair itself is divided into three layers. The pigment that determines the color of hair is found in the middle layer, called the cortex. Black, brown and golden hair contain different concentrations of melanin, but red hair contains another iron containing hair iron pigment similar to blood and rust.

Third: the outer layer of the hair, namely the cuticle, is composed of layers of overlapping scale cells, which can reflect light and give the hair a natural luster. The sebaceous glands connected with the hair follicles secrete oil, which can lubricate and protect the cuticle; the amount of oil secreted determines whether the hair is dry or oily.

matters needing attention

Human hair has many functions: it can resist the direct sunlight or the invasion of cold, keep warm and protect the scalp and brain. In today's society, hair has become an important part of people's appearance. By combing the hair, it can make the female hair black and bright, beautiful and changeable hairstyle, just like wearing a crown.