The function of Lycium barbarum. What good does black crying have for eyes?

Open classification of tears: emotion, disease and human common sense. Tears are a kind of weakly acidic transparent colorless liquid, mostly water (98.2%), and contain a small amount of inorganic salts, protein, lysozyme, immunoglobulin A, complement system and other substances. Tears are divided into two categories: reflective tears and emotional tears. Emotional tears contain more protein than reflective tears, and emotional tears contain a chemical similar to painkillers. Lactoferrin and β -lysine in tears have defensive function and can inhibit the growth of bacteria. In addition, the secretion of tears will promote the normal metabolism of cells and prevent cells from forming tumors. Another point is that the salinity of reflective tears is higher than that of emotional tears. Russian family psychologist nadezhda Shulman believes that tears have proved to be the most effective "prescription" to reduce mental burden. Probably for this reason, women are less likely than men to suffer from nervous tension-induced infarction and stroke. According to statistics, the frequency of men's tears is 1/5 that of women, so men are more likely to suffer from diseases such as ulcers than women. Some studies have also found that prolactin in women's tears is higher than that in men, and this hormonal difference is probably one of the reasons why women love to cry [6]. In fact, when you are wronged or tortured by sadness, you can vent your pain, which is very beneficial to improve your mood. Tears instead of tears are an important cause of ulcers, hypertension and mental disorders. The greatest benefit of tears to the body is that tears help to expel some toxins from the body. We know that besides lacrimal gland, there are dozens of other glands involved in the formation of tears. In this way, the composition of tears is quite complicated. Strong emotional stimulation can make tears contain toxins harmful to human body. The transmission of excitement between one neuron and another neuron in human body depends on a medium central transmitter. If this central transmitter is too much, it will cause too many nerve impulses. To this end, the body should produce corresponding enzymes to decompose excessive central transmitters. Once the central transmitter is too much, the catabolic enzyme cannot be completely decomposed, and it must be excreted through tears. Otherwise, if it cannot be excreted smoothly, these excessive central transmitters in tears will be harmful to people and increase the incidence of ulcers and enteritis. Dr Foley, an American biologist, found that the content of protein in tears shed by emotions is higher than that shed by onion stimulation. That's why I mentioned above that protein shed more tears than reflective tears. And tears also contain protein, which can change people's mood, that is, catechol and amine salts. Only by shedding tears can this harmful chemical be discharged. In addition, shedding tears and crying are also abnormal movements of the respiratory system, circulatory system and nervous system, which also relax emotions and muscles, thus relaxing people. It can be said that whether you cry with sadness or joy, tears are actually a good thing for your health. Don't be too hard on yourself when you encounter problems that can't be solved. When you can't stand it, just cry, as long as it's not too humiliating and doesn't scare others. Also note that sometimes crying for too long will damage memory and attention, and even reduce immunity, or "stop as soon as possible." And if you always can't control your sad mood and always cry endlessly, then you must find the reason. Experts say that this symptom shows that you need to calm down and face reality objectively. Tears come from the lacrimal gland. The lacrimal gland is composed of thin tubular glands and ducts, and it is an organ that secretes tears. The lacrimal gland is located in the lacrimal gland fossa above the orbit, which is divided into two parts: the upper part is the orbit, also called the upper lacrimal gland, which is large and shaped like almonds, about12 mm× 20 mm; The lower part is the eyelid, also called the inferior lacrimal gland, which is relatively small. There are 10 ~ 12 drainage tubes in the lacrimal gland, and the tears are discharged from these drainage tubes after they are produced. Under normal circumstances, the lacrimal gland secretes about 0.5 ~ 0.6 ml of tears during the day to moisten the conjunctiva and cornea of the eyeball, but stops secreting tears when people sleep. Tears are a kind of weakly alkaline transparent liquid, of which 98.2% is water, and the rest is a small amount of inorganic salts, protein group, lysozyme, immunoglobulin A, complement system and other substances. After the tears are produced, they are discharged from the body through the lacrimal passage. The lacrimal passage consists of lacrimal punctum, lacrimal canaliculus, lacrimal sac and nasolacrimal duct. There is a tear spot on the inner side of the upper and lower eyelid margins. Tears enter the lacrimal canaliculus from the lacrimal punctum like a sewer, and enter the lacrimal sac through the canaliculus about 10mm long. Lacrimal sac is specially used to collect and store tears and prevent them from flowing out. The size of the lacrimal sac is about 12mm×6mm, and there is a tube with a length of 12 ~ 24 mm and a diameter of 3 ~ 6 mm below the lacrimal sac, which is the nasolacrimal duct. Tears in the lacrimal sac enter the nasal cavity through the nasolacrimal duct. Therefore, when we order eye drops, we should press the nasal root with our fingers, just to prevent eye drops from flowing into the nasal cavity through the nasolacrimal duct. Tears can't fully explain the change of mood. When foreign objects such as dust fall into our eyes, a lot of tears will be produced to wash them out. Tears contain not only a lot of water, but also lysozyme, immunoglobulin, complement system, lactoferrin and β-lysin, which can inhibit the growth of bacteria. Therefore, tears also have a very important function-defense. In addition, tears can also wet the surface of eyeball and conjunctival sac, changing the optical properties of cornea. Tears are evenly distributed in the conjunctival sac, forming a liquid film, which is called tear film in medicine. The tear film in front of the cornea is called anterior corneal tear film. The tear film is very thin, and the thickness of the tear film in front of the cornea is only 6 ~ 10 nm, but even this thin tear film can be divided into three layers from the inside out: mucus layer, water layer and lipid layer. The thickness of the mucus layer is only 0.02 ~ 0.05 nm; The aqueous layer is the main part of the tear film, with an average thickness of 6 ~ 10 nm in front of the cornea, accounting for 98% of the tear film thickness. It can keep cornea and conjunctiva moist and is the main component of tear function. The thickness of lipid layer is 0.05 ~ 0.5 nm, and its function is to prevent the tears of water samples from contacting with air directly and reduce evaporation. In fact, there is no clear boundary between the three layers of tear film, and they are all gradual. In addition to keeping the eyeball moist, tear film also plays a very important role in improving the refractive system of the eye. The cornea is one of the most important parts of the refractive system of the eyeball, but the cornea without tear film is not smooth, and then things will become blurred. When there is a tear film on the cornea, tears can fill some tiny scratches on the cornea, making the cornea smooth and seeing things more clearly. The tear film on the eyeball is unevenly distributed, but it is thickest at the cornea and thinnest near the eyelid margin, so a theoretical "concave-convex lens" is formed in front of the cornea to improve the refractive performance of the eye. When the upper and lower eyelids are closed, the tear film gradually thickens. When the upper and lower eyelids are closed to 2mm, the tear film forms a slender "concave-convex cylindrical lens", through which things can become clearer. We often see people squinting when they are nearsighted or astigmatism, which is related to this. In addition, the tear film also provides necessary nutrition for the cornea. Why do people cry? As the saying goes; Emotions and sorrows are human nature. Even a person with a strong personality will inevitably shed tears or tears. Moreover, people not only shed tears when they are sad, but also shed tears when they are happy and excited. Exploring the specific reasons for tears, or "heroes don't flick when they have tears" or "tears before flowers and injuries under the moon", there are great differences between people. People will cry when they are sad, sad and sad; People cry when they are happy. Tears seem to be a symbol of emotional changes, but in fact, tears do not completely represent emotional changes. When foreign objects such as dust fall into our eyes, a lot of tears will be produced to wash them out. Tears contain not only a lot of water, but also lysozyme, immunoglobulin, complement system, lactoferrin and β-lysin, which can inhibit the growth of bacteria. Therefore, tears also have a very important function-defense. Anthropologists have found that among many primates, human beings are the only members who can cry and shed tears. Tears are a simple behavior that people are born with. No one can learn. It is as instinctive as heart beating and kidney excretion, as spontaneous as sighing and sneezing. So, why do people cry? What effect does tears have on human body? What's the point? This seemingly simple question has long puzzled researchers. Charles Darwin, the founder of the theory of evolution, once speculated that tears are a kind of "relic" of evolution, which has nothing to do with the survival competition in the process of evolution. When crying, the microvessels around the eyes will be congested, while the small muscles will contract to protect the eyes, causing the lacrimal gland to secrete tears. Darwin thought that for the human body. Tears are meaningless by-products. Achille Montago, an American anthropologist, holds the opposite view to Darwin. He believes that shedding tears is beneficial to the human body, which has a certain influence in evolution, so it can be passed down from generation to generation through natural selection. Human tears are the result of the survival of the fittest. For example, he said: tears contain lysozyme, which is a self-defense substance of human body and can protect nasopharyngeal mucosa from bacterial infection. Observation shows that dry crying without tears is easy to dry the nasopharyngeal mucosa and cause infection. Today, more and more scholars agree with montague that tears may do some good to human body. William Foley, a psychologist at the University of Minnesota in the United States, made a comprehensive study of tears from the perspective of psychology and biochemistry. He divided tears into reflective tears (such as tears stimulated by onions) and emotional tears. In five years, William Foley studied thousands of tearful "volunteers". His statistics show that in a month, men rarely cry more than 7 times, while women cry more than 30 times. The time for most subjects to cry is1&; #0; 2 minutes, crying occasionally 1 hour for 40 minutes. From 7: 00 p.m. to 10, gathering with family and friends or watching TV is the time with the highest frequency of emotional tears. According to private prosecution, about 45% of men often don't cry once a month. Only 6% of women may not cry once a month. 40% of women will cry because of interpersonal relationships such as quarrels, marriage and love. Only 36% of men shed tears because of interpersonal relationships, while the proportion of tears for movies, TV, books and unexplained depression is significantly higher than that of women. Foley collected the tears of the subjects with a special small test tube, and analyzed and tested the tear samples. He found that emotional tears contain more protein, while reflective tears contain more protein. In these complicated protein, there is a chemical that may be similar to an analgesic. According to this result, Frey speculated that tears may be a kind of excretion behavior. It can eliminate biochemical toxins caused and accumulated by emotional stress in human body. These toxins will remain in the body if they are not excreted through tears. It will be bad for health. Emotional tears excrete toxins, restore the psychological and physiological balance of the tearer, and are beneficial to health. But what toxin is excreted through tears? What are the different functions of protein contained in tears? How are they produced and how are they metabolized? I don't even know the benefits myself. Understanding these problems will help people to judge whether Frey's theory is correct. So, why do only humans among primates shed tears? For this, researchers seem to be unable to find a reasonable explanation for a long time. 1960, the British anthropologist Professor Alice Hardy put forward a sensational sea ape hypothesis. According to the previous theory of human origin, the stage of human birth is forest and grassland. Hardy pointed out that in the history of human evolution, there were millions of years of aquatic sea apes. This special stage has left a deep impression on mankind so far, leaving traces of anatomy and physiology; These characteristics are not found in other terrestrial primates, but also in marine animals such as seals, sea lions and seabirds. For example, human lacrimal glands secrete tears, which contain about 0.9% salt. This special physiological phenomenon is also the characteristic of marine animals, and it is the trace left on the human body in the ancient sea ape stage. It is impossible for animals that have evolved and developed on salt-deficient land to produce such physiological characteristics of "salt consumption" Professor Hardy's sea ape hypothesis was once considered as "whimsical" when it was first put forward. However, with the passage of time, this assumption has not been refuted. On the contrary, more and more researchers believe this hypothesis. From 65438 to 0983, Professor Billy Tong Dan, a biologist at the University of Melbourne, Australia, studied and compared the physiological mechanism of controlling salt balance between humans and other mammals. His research also suggested that human tears may originate from the salt secretion mechanism of lacrimal gland of marine animals. The sea ape theory may be the only theory that can explain the origin of human tears at present. However, this theory still lacks reliable fossil basis. It has not been accepted by most anthropologists. As a hypothesis of human origin and evolution, the sea ape theory needs to be further improved. How do human tears originate? Why do people cry? Although researchers have explored this from different angles, these problems are still scientific mysteries. It can be said that the serious research on the behavior of tears has just begun. To solve the secret of tears requires the joint efforts of researchers from all walks of life. So what's the use of tears? Everyone's eyes have a "small factory" that makes tears. People name it "lacrimal gland". Every day, the lacrimal gland is constantly making tears. Tears are of great use. When blinking, tears are evenly applied to the eyeball to moisten the eyeball. Tears can also wash away dirt on the eyeball surface, keep the eyeball clean and kill bacteria. Tears and Emotions People are emotional animals and are easily moved, especially for emotional reasons. Because emotional things are sad, we will cry, which is also the time when we cry the most. Feelings are easy to hurt, so be careful to distinguish them! People look forward to feelings, because feelings can bring them spiritual comfort, like reading touching articles, and like that feeling.