Straight? Wave? Curly? Why Do Different People Have Different Hair Shapes?

Growing up so big, have you ever wondered why some people are born with black straight hair, some are born with curly hair, and some are born with wavy hair. It seems like it has something to do with genes, but it's not entirely related. Today, let me tell you why different people have different hair types.

Ⅰ. Geographical reasons: four different hair types in the global village

In the long process of human evolution and development, the human beings on earth are divided into different races and live in different climates, so the hair patterns of different races also show significant differences. This is the result of biological evolution, which also has the influence of geographical factors such as climate. So Europeans are often rich in hair volume and blonde hair color, African black hair has become a typical symbol... People all over the world have also shown four different hair types in Asia, Europe, Africa and Latin America, different races. Asians have prominent black straight hair, thicker diameter, high toughness, and are not easy to break; Europeans generally have straight curly or wavy hair, including silver-gray, blond, brown-black and black; African hair is usually black curly hair, but the hair is easy breaks; Latin American hair is somewhere between European and African hair.

Among them, Europeans have relatively high scalp hair density and follicular unit density, so the general hair is more abundant. But Asians have relatively higher hair diameters and hair growth rates, while Africans have the slowest growth rates for black curls. As you can imagine, the dry climates of Africa can hardly have enough conditions to nourish hair. As a result of this biological evolution, even with events such as immigration, black hair in the United States is still such black curly hair.

Ⅱ. Other Factors Affecting Hair Type

1. Genes affect the shape of hair follicles and affect hair type

There is a strange phenomenon, almost everyone has seen a person with natural black curly hair in their daily life, even if he is Asian. This shows that biological evolution is not the only factor affecting different hair types. For example, some people are born with naturally curly yellow hair and some people are born with straight black hair. But no matter how long he grows up, he will use his superb hairstyle skills and Tony's skilled hands to make earth-shaking changes and create the same style. People use technology to cover up their genetically controlled hairstyles, constantly reshaping the parts of the body they are most willing to change.

The key to hair shape is not the hair itself, but the shape of the hair follicles on the hair cuticle. The hair follicle is the part responsible for producing hair, and its properties not only affect whether or not hair grows, but also how it grows. If the opening of the follicle is symmetrical to the epidermis, the hair will grow straight. If the opening of the hair follicle is inclined, then depending on the degree of inclination, the growth of the hair is subjected to different degrees of squeezing force from the epidermis, and the hair becomes curly.

The shape of the hair follicle is genetically controlled, so the traits of black straight hair and curly hair are also genetically controlled. Curly hair is autosomal dominant, while black straight hair is recessive. That is, genes influence hair follicle shape, which in turn influences hair type.

2. Sebum secretion: oily hair type or dry hair type

Whether you have black straight hair, curly black hair, or wavy hair, your hair type is also affected by sebum secretion. Imagine a black curly hair that is very oily and has excess sebum production, then after a long time, it will look like black straight hair. Therefore, the secretion of sebum is a very important factor of hair type.

Hair follicles are lined with various specialized glands that secrete oil. This oil is also called sebum. Initially, sebum can move from the follicle to the hair to lubricate the hair. But when the follicles bend, the sebum can no longer fully reach the hair, so the hair is not lubricated and becomes dry.

3. The hair itself also affects different hair types

The formation of black straight or black curly hair is also affected by the hair's own proteins. If the keratin in the hair shaft does not aggregate uniformly, it will increase the degree of bending of the hair, which is equivalent to the uneven force of a rope, which cannot be kept straight in a natural state; bending

4. Abnormal gene expression: hair type cannot be changed

We know that if you have black straight hair, you can get curly hair with a perm. If you have oily hair, you can achieve dry hair with many oil-removing products. But none of the above is true if you're having disorder syndrome.

Hair type or shape cannot be changed in this syndrome. Patients with abnormal expression of this gene typically develop significant symptoms between 3 months and 12 years of age and improve during adolescence. Congenital disorders are often genetically related, and bungee jumping syndrome is no exception.

Examination of the patient's hair with an electron microscope revealed the fluffy hair was triangular or heart-shaped in cross-section and textured from root to tip. The average cross-section of black straight hair is round, while the cross-section of curly hair is inclined. This also explains why patients always maintain a stubborn messy pattern. At present, there is no effective treatment for bungee jumping syndrome, but it has not been found to have a malignant effect on the human body other than changing the shape of the hair.

Australia's 9-year-old girl Sheila is facing such trouble. She has blond curly hair. Her hair was fragile, breakable, and had a special sheen, but no matter how hard she brushed it, it was difficult to keep her hair going for long hang down.