Why can a mosquito s mouth be not very hard, so why can it penetrate human skin?

Mosquitoes are creatures that we often see in our lives, especially at night, many times make us cry and laugh, and make us very upset, because the sound of mosquitoes flying is too annoying, and at the same time they will suck bloodHere people will notice that the mouth of the mosquito is not very sharp, so they wonder why the mouth of the mosquito is not very hard, why can it pierce people's **? In fact, it is because the mosquito's jaw has a hook-like spine, which can scrape the surface of the human surface very well**, so as to suck blood.

First of all, let's talk about the problem of pressure, we generally feel that the heavier the thing, the higher the damage to us, which is right, because the heavy thing will generally be larger for the surface area of contact, which will give us more space to feel greater damage, but small things are also okay, because the contact area is directly reduced, which will lead to greater pressure, such as scissors, for the mouth of a mosquito, it is true that the mouth is not hard, it can only be said that it is general, But it has a hook-like barb on its mouth, which is roughly the place where it is chin, which gives a small space and a lot of pressure.

So at this time, mosquitoes can use this hook to break through our surface**, and finally directly lead to**Don't tear it open, but the mouth is very small, and it is only enough for mosquitoes to suck blood, but it is enough for mosquitoes, and I would like to remind everyone here that we must pay attention to personal hygiene in our daily life, especially for the summer has come now, many times there will be a lot of mosquitoes, not to mention the discomfort of blood sucking at this time, and the risk of infecting some diseases.

For mosquitoes are very common, we must pay attention to good hygiene at home, so that we can control a certain degree well, and ensure our health, after all, after being bitten by mosquitoes or sucking blood, there will be a certain amount of pain, and there is itching and uncomfortable, which is very troublesome and requires a certain amount of time buffer.

The human ** is still quite elastic, but the mosquito's mouth is so small, how can it pierce into the human ** to suck blood? I'm going to dissect the mouth of a mosquito.

Because the mosquito's mouth is very small and the straw is very thin, it can easily pierce people's **.

Because the mouth of the mosquito is very thin, you can find the sweat pores on the human **, and you can completely pierce it through this hole.

Because the mouth of the mosquito is very thin, and the human ** is not very tight, it can easily pierce the ** of the human.

Today, let's talk about it, how does the mosquito's mouth penetrate our human body with such a thin mouth?

In fact, the mouth of a mosquito is not a needle, but a very complex result, but because the mouth of a mosquito is very small, we cannot clearly see it with the naked eye.

When the outermost two needles cut the epidermis, and then use the other two needles to separate the ** tissue, and finally the mosquito is pierced into the body with the last two needles, and there are receptors at the real tip, you can feel a certain chemical, it can naturally seep out in the blood vessels of the human body, which can guide the direction of the mosquito.

Not only that, mosquitoes also spit when they suck blood, and some viruses are transmitted in the process of mosquitoes spitting, which is a way of transmission of many viruses, that is, "mosquito transmission".

It is because the mouth of the mosquito is thin enough like a needle that it can unconsciously penetrate the mucous membrane and suck the blood of human beings.

The mouth of the mosquito is very thin and soft, and the mouthparts of the mosquito can be pierced into the mouthparts of the mosquito because the mouthparts of the mosquito go along the pores of the person, rather than directly into the person's mouth.

In the case of mosquitoes deliberately. There is also a small beak with a small stress area, which is easy to enter**.

The most annoying and disgusting creature in the world is probably mosquitoes, and if mosquitoes fly when sleeping at night, it can make people feel collapsedAnd it will also suck blood, and people will wonder why the mosquito's mouth is not very hard, but it can pierce people's **? This is mainly because there is a barb under the mouth of the mosquito, which can harm our **.

First of all, in fact, if we compare with natural creatures, it is really fragile, after all, it is soft, and for creatures like mosquitoes, they prefer to suck blood, especially at night, stay in the wild for a night, and get up the next day The body is full of bags, which is sucked by mosquitoes and bitten, etc., and after the discovery of biologists, the mosquito itself is not hard, but there is a barb under the mouth, which can instantly improve the ability to pierce, and this stinger is very small, It's almost invisible, but those who have studied pressure must know that although the surface area is small, the corresponding pressure will be higher.

For example, in ordinary life, a pair of scissors can be good for the area pressure, but it takes a certain amount of strength to pierce some objects, but if it is just a small needle, although it is small, the area that can be contacted is also very small, but the targeted pressure that can be brought is very large, so it can achieve a good effect, and the same is true for the barbs under the mouth of mosquitoes.

Especially for summer, many times do not pay attention to closing the windows at night, a lot of mosquitoes will fly in, and the next day I get up only to find that I have some more bags on my body, so it is recommended to light a mosquito coil and close the window before going to bed at night, which can reduce the number of mosquitoes well, and usually pay attention to the hygiene of the house, after all, mosquitoes prefer places with a bad environment, and there are many viruses themselves.

Whenever we enter the hot summer, I believe that you will have all kinds of troubles when you fight, such as many times when we go out, because we are worried about being tanned, we will do all kinds of necessary sunscreen measures, and there will be a lot of sweat every day, and finally there are a lot of mosquitoes, we all have such questionsWhy is the mouth of a mosquito not very hard, but it can pierce a person's **? In fact, this has a lot to do with the pressure in our air, so let's analyze it in detail.

Whenever we enter the hot summer, many of us will have such troubles, no matter where we go, those mosquitoes are particularly numerous, such as mosquitoes on the dining table, blood-sucking mosquitoes and small mosquitoes, all kinds of mosquitoes fly around in the air, seriously affecting our normal life, not to mention which mosquitoes will suck blood, it is generally easy to appear at night, if you don't light mosquito coils or spray some insecticides and the like, it is difficult to fall asleep at night, which will also seriously affect our sleep quality.

We all know that the mouth of the mosquito is not very hard, but it can pierce into the human body, because the mouth of the mosquito is not very hard, so if they want to pierce the human body, then they can only work the mouth, at this time they will increase the strength of the mouth piercing, and the mouth of the mosquito is particularly sharp, especially the kind of sharp-billed mosquito, the area is very small when it pierces the **, so small that you can hardly see it.

In the process of piercing in, a force called strong pressure will be generated, and it is because of this force that the mosquito will pierce into the human body. In addition, there are a lot of pores in our human body, and sometimes we don't notice it, so it is quite easy for mosquitoes to pierce the human body. After we are bitten by a mosquito, a lump will grow on the bite site, which is very itchy, so we need to take necessary measures to prevent insects.

Under the same pressure, the smaller the force area, the greater the pressure, the mosquito's mouth is very small, and it does not need to be very hard to pierce the human body, and the most important thing is that the human body is not very hard.

Because the mouth of the mosquito is very thin, it can easily stab into people's **, and it is not easy to be detected by humans.

The upper and lower lip of the mosquito has a distinct gradient, and the closer to the tip, the higher the elasticity and hardness, which helps to improve the mosquito mouth needle penetration**.

Such a mosquito appeared on August 31.

The upper lip and lower jaw of mosquitoes show obvious gradients, and the closer to the tip, the higher the elastic modulus and hardness values, and this gradient distribution of mechanical properties helps to improve the ability of mosquito mouth needle penetration.

Numerical simulation analysis shows that the instability failure of mosquito mouth needle is mainly in the form of local instability failure at the tip, and the mechanical properties of the local material at the tip play a decisive role in the critical pressure of failure macro-prudent stability. This is well illustrated by the gradient exhibited by the mosquito mouth needle, which is the result of natural optimization.

Let's first study the two most critical parts of the mosquito mouth needle penetration**: the upper lip and the lower jaw. The tip of the upper lip is very pointed, with a radius of curvature of about 100 200 nanometers, which is much smaller than the grain size of conventional metal materials (e.g. 1 100 microns for industrial pure iron), and such a small "needle tip" is difficult to make with ordinary metal materials (the radius of curvature of the tip of an ordinary sewing needle is about 100 microns).

The tip of the jaw of mosquitoes is also very sharp, with a radius of curvature of about a few hundred nanometers. Interestingly, it has a row of tiny and delicate serrated structures on both the outside and inside of its jaw (see figure), which have sharper tips and a radius of curvature of about 50 150 microns. In general, the number of serrations at the tip of the jaw varies depending on the species of mosquito.

Mosquitoes with fewer than 14 serrations feed mainly on human blood, while those with a higher number of serrations feed mainly on the blood of domestic animals. The greater the number of micro-nano sawtooth, the stronger the piercing ability.

We measured the mechanical properties of the upper lip and lower jaw of mosquitoes using nanoindentation technology, and found that the elastic modulus is comparable to that of polymer materials, and the surface hardness is comparable to that of metal materials, and the closer to the tip the surface hardness is, the higher the surface hardness. It is this mechanical property that makes the mosquito mouth needle not only easy to pierce**, but also freely bend under the skin to find capillaries.

Observed with a high-speed camera, it was found that the process of mosquito mouth needle piercing** was not a simple puncture.

Before piercing, the mosquito will straighten its mouthparts and stab at ** quickly. It is a dynamic impact process: the tip of the upper lip first punctures the ** surface, after which, as the penetration depth increases, accompanied by periodic vibrations, which drives the lower jaw with micro-nano serrations to be sawed open**.

In the initial stage of vibration penetration, the head of the mosquito vibrates at a high frequency, about 10 15 Hz; In the intermediate penetration phase, the vibrational frequency gradually decreases to 6 8 Hz; The vibration frequency in the final stage is only about 3 5 Hz.