Hair grows from the roots, hair grows from the roots or from the ends.

Hair grows from the roots, and there are two facts that can explain it: first, the production of gray hair, it can be seen that it is first gray hair roots, and then slowly gray to the tips of the hair; Sometimes the white hair we pluck is half white and half black, and it is clear that the half at the root of the hair is white. Second, baked and dyed hair, the fading also starts from the roots, indicating that the hair grows from the roots, so the new hair grows out of it, and the color of baking or dyeing is completely different.

Hair grows from the hair follicles at the root of the hair.

The hair follicle is the part of the hair root in the dermis and is composed of the inner hair root sheath, the outer hair root sheath and the hair bulb, and the inner hair root sheath is the sheath directly adjacent to the hair in the late phase of the hair phase. The inner hair root sheath is a stiff, thick-walled keratinized tube that determines the shape of the cross-section of hair growth.

The fur cortex is the main component of hair and is made up of elongated cells that run parallel to the long axis of the hair. In these cells there are about 10 mm of tensile filaments and interfibrous matrix, which determine the main physiological traits of the hair.

1. Hair grows from the roots.

2. Hair grows about 1 cm per month. Hair growth and replacement are cyclical. The normal hair growth cycle can be divided into three phases: anagen, catagen and telogen phase, in the anagen phase, hair grows from the base of the hair follicle and can grow continuously for 2-6 years until it is fully grown, followed by the catagen phase, which is 3 weeks, during which the hair stops growing and the hair roots shrink.

3. The physical properties of hair are related to its chemical composition. When the hair is soaked in water, it will swell quickly, and the weight after expansion is about 40% higher than the dry weight before soaking, which indicates that the hair is almost purely protein and has very little lipid. The hair has a strong duality due to the arrangement of the filaments in the cells that are parallel to the long axis of the hair.

Hair is grown from the roots.

Hair comes out of the follicle gradually, so it grows from the roots, not the ends. In order to have better hair, you need to pay attention to the balanced nutrition of the diet, and do not neglect the intake of other types of food because of the preference for one food, only in this way can you replenish all the nutrients that the body needs.

In addition, you should also pay attention to ensure adequate sleep, do not stress too much, and secondly, pay attention not to perm and dye your hair frequently, so as not to damage the hair caused by hair dyes and perms, causing dry and split ends of the hair.

Hair introduction

Hair, which refers to the hair that grows on the head. Hair is not an organ, so it does not contain nerves and blood vessels, but it does contain cells. Hair, in addition to adding beauty to a person, is mainly used to protect the head.

Fine, fluffy hair is elastic to withstand lighter bumps and can also help evaporate sweat from the head.

The average person has about 100,000 hairs, and the length of the hair is the longest among all hairs, especially for women with long hair. Some can grow up to 95 100cm, or even 150cm, but generally do not exceed 200cm. Hair color is generally genetically determined, and the most common ones are black, blonde, brown and red.

When humans age, the hair usually turns silvery-white.

Depending on ethnicity and region, hair comes in jet-black, blonde, reddish-brown, reddish-brown, pale yellow, grayish-white, and even green and red. Scientific studies have proven that the color of hair is related to the different metallic elements contained in the hair.

Black hair contains equal parts copper, iron, and melanin, and when the amount of nickel increases, it turns grayish-white. Blonde hair contains titanium, reddish-brown hair contains molybdenum, reddish-brown hair contains cobalt in addition to copper and iron, and green hair contains too much copper. In some African countries, some children have red hair, which is due to a severe lack of "protein".