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Why is there such a big difference in the color and quality of human hair?

 

Why do some people have black hair and some people have yellow hair?

Why do some people get oily when washing their human hair every day, and some people have dry human hair like straw? To answer these questions, we must first understand the basic composition of hair and the factors that affect hair growth and sebum secretion.

 

 hair consists of hair shaft and root

 

human hair shaft

 

The human hair shaft is the part exposed outside of the scalp, which is what we commonly call "hair". The hair shaft is divided from the outside to the inside: small cortex (small skin, which is what we often call hair scales), cortex (also called fur texture or hair core), medulla layer

 

The basic structure of human hair

human hair scales protect the hair against external damage. Usually when the hair is in alkaline condition, the hair scales will open. Will swell in contact with water. As the hair shaft is exposed to the environment for an extended period of time, the hair scales continue to suffer various damages, including physical abrasion, chemical damage, etc., resulting in varying degrees of denudation. Therefore, the scaly structure on the hair shaft is smoother as it is closer to the scalp, and rough and incomplete as it is farther from the scalp. Different hair types have different shapes of cuticles, and their strength and tensile strength are also different.

The cortex is the most important part of the hair shaft. The color of the hair is determined by the type and amount of melanin in the cortex. Melanin is composed of eumelanin and pheomelanin. Eumelanin is black, while pheomelanin is mainly red. Oriental hair is thick and hard, mainly melanin, so the hair is darker. Westerners have fine and soft human hair with a high content of pheomelanin. Because the content of pigment and the ratio of pheomelanin vary from person to person, Westerners have a variety of hair colors, from brown-black and red to golden and light yellow. The main component of fur quality is keratin, and the formed fibers are twisted and twisted in a twist shape, which determines the toughness, elasticity and strength of the human hair.

The medulla layer is the central part of the hair, surrounded by cortex. The medulla layer has low sulfur content and has a special physical structure that is particularly resistant to chemical reactions.

 

human hair root

 

The human hair roots buried in the scalp are protected by  hair follicles. The  hair follicle is a narrow tube that goes deep into the dermis and subcutaneous tissue. Each human hair follicle grows one hair, and the lower end of the hair follicle swells, called the hair bulb. A depression is formed at the bottom of the hair bulb, which contains a mass of dermal tissue with capillaries, which constitutes the hair papilla.

 

The dermal papilla and connective tissue sheath transport nutrients to the human hair and produce special substances to regulate hair growth. If the dermal papilla is damaged or degenerated, the hair will stop growing and gradually fall out.

 

In thehair bulb surrounding the hair papilla, there are many actively dividing cells called raw brazilianhairtop human hair matrix cells, which can produce the structure of the  hair shaft (that is, the source of hair dry matter).

 

The hair bulb is the beginning of the human hair. There are many pigment cells in the upper hemisphere of the hair bulb, and the melanin produced makes the hair shaft color. The sebaceous glands in the dermis also open in the channels formed by the hair follicles. Their main function is to secrete oil and moisturize the hair and scalp. Generally, the hair can be divided into neutral, oily and dry according to the amount of oil secreted.

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