Why is there a difference in the color of the eyes and a different color in the hair?

What I found is that the general hair color is dark, such as dark black, and his pupil color is also dark, if the hair color is light, such as coffee, his pupil color is also lighter, hehe, it's genetic.

1. Let's talk about the eyes first: Scientists have found that the iris of our human eye is composed of five layers of tissue. They are the endothelial cell layer, the anterior bounding membrane, the stromal layer, the posterior bounding membrane, and the posterior epithelial layer.

In these five layers of tissue, the stromal layer, the anterior bounding membrane, and the posterior epithelial layer contain many pigment cells, and the amount of pigment contained in these cells determines the color of the iris.

The more pigment contained in the pigment cells, the darker the iris and the darker the eyeballs. And the less pigment, the lighter the color of the iris, and the lighter the color of the eyeballs.

2. Let's talk about hair: The different colors of human hair are related to the content of melanin in the epithelial cells of the hair. The hair color of yellow and black people is jet black because it contains a lot of melanin; Caucasian hair is mostly yellow or light yellow because it contains less melanin.

Therefore, because of different races, the content of pigment is different, resulting in different colors of hair.

However, even if they are also black-haired yellow people, some people have black and shiny hair, while others have yellow and brittle hair, what is going on? This is because the hair follicles that grow hair have sebaceous glands that can secrete oily sebum; When each strand of hair is pulled, sebum seeps out from the sebaceous glands and runs down the hair, moisturizing the hair. Everyone's sebaceous gland secretion is different, and it is generally related to living conditions and health conditions.

The nutritional structure is out of balance, with low protein and fat content; frequent sun exposure; Wash your hair often with alkaline soaps; Frequent hair dyeing and perming will cause the hair to be dull and dull, or fall out. And if a person is healthy and well-nourished, the hair will be dark and shiny.

In fact, the color of the eyes and hair is similar to **, which is the result of different pigmentation, but it may be slightly different because of the pigment differences involved.

The color of your eyes is relatively simple, mainly because the amount of melanin precipitation determines what color your eyes are. If you look at it from the front, the darkest place in the middle is the pupil, and the colored circle is the iris, and the melanocytes in the iris determine the color of the eye.

Cells contain organelles called melanosomes. The melanosomes in different human cells are different, which in turn changes the ability of the iris to absorb light, and the eyes will also show different colors: there are fewer melanosomes, and the translucent iris will reflect blue or green eyes due to the Tyndall effect, while more melanosomes, the iris has a stronger ability to absorb light, and it will show dark brown eyes.

Therefore, the different colors of the eyes are not determined by the blue or green pigment in the eyes of Europeans, but by the amount of melanin.

In the same way, red eyes are not due to the presence of red pigment in the eyes. Red or purple eyes can only occur in patients with very severe albinism - because they cannot synthesize melanin, then the iris naturally does not have melanin, and the color of the blood vessels in the eye will be exposed, and it will become red eyes.

The cause of gray hair is similar: hair does not produce pigmentation, and naturally it is white hair.

Therefore, people with albinism are often white-haired and red-eyed.

Is there a correlation between the colors?

Red eyes and gray hair are always associated with each other, and I am sure you will think of another interesting question: is there a correspondence between the color of eyes and hair? Indeed, among young people, it is rare to see someone who is born with white hair and black eyes.

Compared with Asians and Europeans, it is not difficult to find that we with yellow ** and black eyes tend to have black hair; And white** Europeans and blue-eyed Europeans tend to have blonde hair ......Wait, shouldn't their hair be gray according to this law?

Red and other hair colors are many in the white** crowd.

But in fact, the hair is more complicated than the eyes: in addition to eumelanin, which regulates the change of hair from white to gray to black, there is also brown melanin (also known as pheomelanin) that can make hair appear red or orange.

Therefore, the ratio of these two pigments is different, and there will be different hair colors: more eumelanin, darker and darker hair; There is more brown melanin, the hair is redder, and the corresponding closure and reduction will be reduced, and there will be various kinds of golden, pale and maroon.

As a window to the human mind, the eyes will always attract people's attention, but if you look closely, you will find that many people have different colors of eyes, why is that?

Chinese are not black eyeballs, look carefully in the mirror and find that to summarize myself, light brown Caucasian iris pigment is less, grayish-blue; Yellow people have more pigments and are brownish-yellow; Blacks have the most pigment and are black in color. It has been recorded that people see the following colors: blue, light blue, light gray (in fact, there is a kind of near-transparent human eyeball color, I once saw a model's eyeball color in Ricky Martin's music video, but there are too few such people, legend has it that only women with witch blood have eyelids), brown, green, pale yellow (can be classified as brown inside), red (suspected to be pink eye......).The reason why people of different races have different eye colors is because of the different colors of the iris.

The eyeball is like a delicate camera, with a transparent cornea in the front, like a convex lens, and iridescent in the back, the density of its pigment determines the color of the eyeball. Depending on the pigment contained in the iris, the iris presents different colors; The difference in the color of the human eye is due to the "content" of pigment contained in the iris, the membrane where the pupil is located. In fact, the pigment of various races is almost the same, the difference is only the content, which is determined by genes, the number of dominant genes that determine the amount of pigment is different for different races, and it is the contrast relationship between pigment determining genes that determines the color of the iris of the pupil just as "palette", Caucasian dominant genes are few, so the iris of Caucasian people is more light-colored, and the pigment genes also determine their skin color and hair color, so blonde hair and blue eyes are the unique charm of Western beauties; People of color have a large number of dominant groups in pigment-determining genes, so they have darker pupil color, skin color, and hair.

The Mongolian race, which is what we call the yellow race, has brown pupils, so the black hair and yellow ** are actually not true! I don't envy the blonde hair and blue eyes of white people, I mean I envy their naturally fair-skinned **!! No need to take a milk bath.

As the window of the human soul, the eyes will always attract people's attention, but if you look closely, you will find that many people's eyes will have different colors.