1. Spicy is painful!Not taste.
There are a total of 100,000 human taste buds, and through different transmission mechanisms, they can finally recognize various tastes based on sour, sweet, bitter, salty, and umami.
Spicy is not a sense of taste, but a chemical that stimulates cells to create a sensation in the brain that is similar to a micro-stimulus similar to burning, which is a sense of pain.
2. Don't panic when you see how many hairs you have lost when you wash your hair
Hair has its own lifespan, it grows to a certain length, and when the lifespan is reached, it will naturally fall out and die of old age, so hair loss is a normal phenomenon. Adults lose an average of 7-100 hairs per day. Therefore, when you see yourself losing your hair, don't panic first, it is likely to be a normal physiological phenomenon.
3. The number of bones of a newborn baby is 305, nearly 100 more than **
* The number of bones is only 206, and the number of bones of newborn babies is as many as 305, and in the process of growing slowly, some bones will merge, and the number of bones will shrink to 217 218 in childhood, and when they grow into adulthood, there are only 206 bones left.
Because the bones are different in different age groups and genders, archaeologists can infer the gender and age of the tomb owner only from the remaining skeletons when studying ancient tombs.
4. The pixel of the human eye kills the camera
The eye is an extremely perfect and complex structure of the human body, through which we can see mountains and rivers, the sun, moon and stars, and see joys, sorrows, joys, good and evil. But it is extremely fragile, so there have been many "myopia" throughout the ages.
The object we initially see through the eyes is upside down, and the reason why we end up seeing it is upright is because it is finally processed and interpreted by the brain and a series of optic nerves. In today's society, it is already clear to be able to take pictures with a camera or mobile phone with tens of millions of pixels. But did you know that the human eye has up to 5 pixels7.6 billion, instantly kill all cameras.
5. The total length of blood vessels can go around the earth25 laps
The total number of capillaries of a ** is more than 30 billion, the total area of capillaries can reach 6,000 square meters, and if all are connected end to end, the total length of blood vessels can reach more than 62,000 miles, at least 25 laps
6. Although the composition of huge human cells is similar, the lifespan, shape and size are different.
There are about 40 trillion to 60 trillion human cells, which is similar to the number of human beings on the earth, and it is a wonderful thing to imagine that there are global "cell people" in our bodies who only serve us all the time.
The basic composition of these cells is similar, but they vary in lifespan, shape, and size, hence our complex human body structure. They vary greatly in size, the largest diameter is about 200um, the smallest diameter is only 5um, don't look at small cells, but there are dozens of chemical elements;In order to match the environment in which they are located and the physiological functions they undertake, they have different shapes, such as flat shapes, spherical shapes, columnar shapes, cubes, pyramid shapes, etc., as well as irregular shapesCells are constantly aging and regenerating, and different cells have different lifespans, ranging from long ones to human lifespans, such as spinal cord cells, to short ones that may only last a few hours, such as our "health guard" white blood cells.
7. There are a lot of mites on our eyelashes
These mites belong to the Demodex genes, they are almost transparent, with a length of only 1 3 mm, so they are difficult to detect with the naked eye. In general, these mites are harmless to humans and occasionally cause some allergic reactions. But for some reason, Demodex mites multiply, which can lead to various eye diseases. If one day you notice white dots on your eyelashes, it's probably a mites.
In fact, where our sebaceous glands are more abundant, they are all places where mites gather, such as: nose, forehead, face. In each small ** hair follicle, there are often multiple mites parasitic at the same time, and the thought of millions of hair follicles on our bodies, and each hair follicle may be full of mites, I dare not think about it, it is too terrifying.
Do you remember the "sun smell" after the quilt was sunburned, that was the smell of roasted mites?