See through the magical structure inside the human body. Our body is a complex "machine", and various organs are its "parts". These knowledge points are constantly guiding children to comprehensively and systematically understand the human body and help them develop good living habits. The following is why they grind their teeth when sleeping, which I carefully recommend for reference only. Welcome to read!
Why does sleep grind your teeth
Excessive emotional tension, excitement, fatigue, shock and other mental factors make the excitement or inhibition process of cerebral cortex abnormal, resulting in night molars.
Due to overeating, food accumulation and indigestion, the toxins secreted by bacteria in the gastrointestinal tract stimulate the cerebral cortex after absorption, which makes the excitement and inhibition of the cerebral cortex out of balance, resulting in night molars.
Serious night molars are dry grinding of upper and lower teeth, which will accelerate the wear of teeth, cause periodontal tissue damage, masticatory muscle fatigue and temporomandibular joint dysfunction, so they should be actively prevented and treated.
Eliminate tension, remove unnecessary concerns, be open-minded and arrange work reasonably. If necessary, take a small amount of diazepam under the guidance of a doctor.
Develop good living habits, live regularly, don't eat too full for dinner, and don't do strenuous exercise before going to bed.
Wear dental pads. The above treatment is still not improved. You should see a dentist to make a night molar appliance, also known as dentition jaw pad or tooth pad, which should be worn on the dentition at night and removed in the morning. The dental pad can separate the direct contact between upper and lower teeth, reduce tooth wear and periodontal injury, and alleviate muscle fatigue. At the same time, the signal transmitted from periodontal ligament to central nerve is changed to inhibit the activity of nocturnal molars. Practice has proved that the number and time of nocturnal molars are significantly reduced after wearing tooth pads.
Why is it easy to have diarrhea when eating carelessly in summer
You may have had diarrhea, especially in summer. There are many cases of diarrhea due to improper diet. Is diarrhea related to bacteria in food? Yes, improper diet and diarrhea are mainly related to pathogenic bacteria in food. Pathogenic bacteria are a kind of dangerous bacteria that can cause disease. Most pathogenic bacteria are most suitable for growth and reproduction at a temperature similar to our body temperature, about 37 ℃. In all seasons of the year, only summer is the closest to this temperature, so the pathogenic bacteria that pollute food in summer will grow and reproduce quickly. One bacterium will become two in 15 minutes and more than 16 million in 6 hours. Some bacteria need a large number to be harmful to people, but others can make people sick as long as there are 15-20 bacteria.
In summer, people sweat more, dilute gastric juice after drinking a lot of water, and have a bad rest, which reduces human resistance and creates conditions for the invasion of pathogenic bacteria. In addition, in summer, people will eat all kinds of melons and fruits, cold drinks and cold meat and vegetable dishes. If these foods are not carefully prepared, they are easy to be polluted by pathogenic bacteria. Diarrhea caused by eating contaminated food is called infectious diarrhea. Dozens of pathogens are known to cause acute intestinal infectious diseases with diarrhea as the main symptoms, such as Shigella causing bacterial dysentery, Salmonella causing gastrointestinal food poisoning, Vibrio parahaemolyticus, Staphylococcus aureus, enterohemorrhagic Escherichia coli, and so on. These diarrhea pathogens widely exist in water, seafood and the intestines, viscera and muscles of livestock. If the water, meat, eggs, milk and seafood we eat are polluted by these pathogens and are not cooked thoroughly before eating, it is easy to lead to intestinal diseases.
In case of diarrhea and vomiting, first of all, go to the intestinal clinic of the hospital in time, so as to get timely and correct treatment. If you can't go to the hospital in time, you should take oral liquid containing glucose and electrolyte in time. This oral rehydration can be bought in pharmacies. After diarrhea, the body loses the most fluids and electrolytes. Once the human body is dehydrated, it is likely to cause renal failure, which is the main cause of death from diarrhea. Every year, about 1.8 million people in the world die from intestinal diseases caused by food and drinking water polluted by pathogenic bacteria. Therefore, we must pay attention to the prevention of intestinal infectious diseases.
Why is the sky blue
In fact, the reason why the sky is blue is that three simple factors are combined: sunlight is composed of many light with different wavelengths, the earth's atmosphere is composed of molecules dispersing light with different wavelengths, their sizes are different, and our eyes are very sensitive. Put these three things together,
Sunlight is composed of light of all different colors... The photosphere of our sun is very hot, close to 6000K. It emits a broad spectrum of light, from ultraviolet to visible, from purple to red, and then deep into the infrared part of the spectrum.
Energy light is also short wavelength (and high frequency) light, while light with lower energy has longer wavelength (and low frequency) rather than high energy. When you see a prism splitting sunlight into its components, the reason for the splitting of light is that the wavelength of red light is longer than that of blue light.
In our daily life, different wavelengths of light react differently with matter, which is extremely important and useful. The large hole in the microwave oven allows short wavelength visible light in and out, but keep the longer wavelength microwave light reflecting it. The thin coating on sunglasses reflects ultraviolet, purple and blue light, but allows long wavelengths of green, yellow, orange and red to pass through.
These tiny invisible particles make up our atmosphere - molecules like nitrogen, oxygen, water, carbon dioxide and argon atoms that scatter light at all wavelengths, but more effectively at short wavelengths.
Because these molecules are much smaller than the wavelength of light itself, the shorter the wavelength of light, the better it scatters. In fact, it quantitatively follows a law called Rayleigh scattering, which tells us that purple light in the short wavelength range of human vision is more than nine times more than red light in the long wavelength range. (the scattering intensity of the wavelength is inversely proportional to the fourth power: I ∝ λ- 4)。
When sunlight shines on every corner of the earth's atmosphere, the red wavelength of light will only be scattered by 11%, so it is like purple light in your eyes.
When the sun is high in the sky, that's why the whole sky is blue. It looks brighter farther from the sun because there is more atmosphere (and therefore more blue light) in these directions. In any direction, you can see scattered light from the sun, illuminating the entire atmosphere between your eyes and outer space. This has some interesting effects on the color of the sky, depending on the position of the sun and where you are looking.
If the sun is below the horizon, light must pass through a large amount of atmosphere. Blue light is scattered in all directions, while red light is unlikely to scatter, which means it will reach your eyes. If you fly before sunset or sunrise, you can see the spectacular effect.
From the space description and the images of astronauts returning, this is a better perspective.
At sunrise / sunset or monthly rise / sunset, light from the sun (or moon) must pass through a large amount of atmosphere. The closer it is to the horizon, the more light passes through the atmosphere. When blue light is scattered in all directions, the efficiency of red light scattering is much lower. It means that the light from the moon and the sun itself has only been scattered to red twice, but it also means that the light from the moon itself has become red.
During a total solar eclipse, when the shadow of the moon falls on you and blocks the direct sunlight from a large area around you, the horizon will turn red, not elsewhere. On the path of the total eclipse, light shines in all directions, which is why the sky is still blue in most places. But near the horizon, the light scattered in all directions is likely to scatter again before reaching your eyes. Red light is the wavelength of the light most likely to pass through, eventually surpassing the more effective scattering of blue light.
So even so, you may have another question: if light with shorter wavelengths scatters more effectively, why doesn't the sky appear purple? In fact, more purple light comes from the atmosphere than blue light, but there are also mixtures of other colors. Because your eyes have three types of cones (used to detect color) and monochrome rods, these are all four signals that need to be interpreted by your brain when assigning color.
Each cone and rod is sensitive to different wavelengths of light, but they are stimulated by the sky to some extent. Our eyes respond more strongly to blue, cyan and green wavelengths than violets. Even more violet light is not enough to overcome the strong blue signal transmitted by our brain.
This is a combination of three factors: 1. Sunlight is composed of many light with different wavelengths. 2. The particles in the atmosphere are very small, and the scattered light with short wavelength is more effective than that with long wavelength. 3. Our eyes respond to all kinds of colors
This makes the sky blue to humans. If we can see ultraviolet rays very effectively, there will be more purple and ultraviolet rays in the sky; If we only have two types of cones (like dogs), we can see the blue sky during the day, not red, orange and yellow at sunset. But don't be fooled: when you look at the earth from space, it's also blue, but the atmosphere has nothing to do with it!