Monologue of small intestine

Hello, everyone, I'm Xiao Chang. You can see from the human point of view that I connect the large intestine under the pylorus that connects the stomach. Before you learn the structure and function of human body, you may only know that I am suitable for roasting hot pot. When the small intestine is first served, it may be a slippery pink unknown object on a lettuce leaf, but after cooking, it may be chewy. And I'm actually very easy to stretch, and the area is very large. In your little belly, I am 5~7 meters long, all piled up into a tangled ball, curled up in your belly. You and I have one thing in common, that is, we have hair. There are many small hairs in my analogy, and there will be a little smaller hairs on those hairs, which are more subtle and I have a special function, that is, I can crawl on the ground like a caterpillar, but unlike a small caterpillar, my crawling is regular. The crawling of a caterpillar can only make the caterpillar move, but my crawling is different.

Then the question is, why on earth should I squirm? Actually, it has something to do with my career. I live in a company called Digestive System, which is responsible for digestion. When a food is eaten in the human body, we are responsible for digesting and absorbing it. In this company, there are many departments, and each department has its own responsibilities. My duty is to be responsible for the particularly important digestion and absorption part. I am under great pressure, because the whole digestive system can't work normally because of poor digestion and absorption, but I am not the ultimate department, and there is another department called large intestine after me. Our work will be passed down like a baton. For example, when we come into contact with work, first of all, in the mouth, saliva in the mouth will make the nutritional components of food change chemically. When food enters the mouth, the dental carving in the mouth will use different special functions to chew the food into small food balls that are beneficial to swallowing, stir the tongue, and then let it swallow, while the saliva will soften it, and then the baton will be passed down to the pharynx. But in fact, the esophagus is specially responsible for transportation. It ran around like a messenger, and then it went to the stomach. The stomach will break down the work and then digest it, which can turn the food balls in our work into chyme and also store food. When starch protein and fat enter the stomach, the digestive enzymes in the stomach will only digest protein, which means that the stomach can only digest a part of food. After all, its ability is limited and its energy is limited. Otherwise, digestion is limited. After food is digested in the stomach, it reaches the liver, gallbladder and pancreas, first of all, the biliary system, but the bile system does not completely digest fat, and the bile capacity is limited, which can only play the role of emulsification. So can pancreas be emulsified? The answer is yes, because all kinds of digestive enzymes are secreted in the pancreas, so it can be digested, and if the food we eat at this time is toxic, then the liver will try to dilute a small amount of poison.

However, the human body needs energy, but what these departments do is to digest food, but only digestion can not provide energy for the human body, because the human body has not absorbed it, so when the baton came to me, as an important department in the digestive system, I began to absorb nutrients in food.

I'm telling you, it's not that I'm conceited, but that I'm good. If the human body doesn't have my absorption function, then the body has no energy, no power and no life, just as the ancient people didn't invent fire. Well, it's terrible to think about it. The peristalsis I mentioned earlier is to help me absorb the nutrition of food, because if I don't peristalsis, my 5-7-meter-long body can only use a short period of time and absorb it slowly, so through my peristalsis, I can make full use of my slender body to absorb food. In addition to absorbing this important function, I also undertake a little digestion, because I am the penultimate digestion and absorption department in all departments, and I need to check for leaks, so my digestive enzymes are exactly the same as this, and I can also chemically digest various macromolecules.

Having said so much about my purpose, are you curious about how I did it? Actually, it has something to do with my own structure. In order to achieve the function of digestion and absorption, I have a whole six-layer structure, the outermost layer is used for protection, and the penultimate layer is the muscle layer, which can be used to help me crawl. The third layer is the submucosa, where the connective tissue and muscle tissue you mentioned play a buffering role, and the other layer is the intestinal body, which, like the mucous membrane that secretes intestinal juice, is used to secrete digestive enzymes, which makes me digest, and the outermost layer is my villi. I'm telling you, my fluff is really super powerful. It's not the same as your outer human fluff, and so is yours. In fact, the function of this fluff is my most important absorption, and my absorption depends on it. In other words, without my villi and microvilli, there would be no such thing as the small intestine providing energy.

And after I finish my duties with these structures, it will be transmitted to the large intestine, which is responsible for the water that I didn't absorb at last. This is the coordination of our digestive system. We need to eat food from the mouth first, then through the esophagus, through the stomach, then through the liver, gallbladder, pancreas and finally come to me. In the whole process, each of our departments must cooperate seamlessly so that food can be absorbed and digested.

Look how powerful I am. I am really powerful. You like to call me arrogant, but I really think I am the most powerful and important one in all digestive systems. But although I am important, you don't pay attention to me. You have been hurting me. You told me that you eat so many sweets, cakes, biscuits and other foods, and there are so many meats and fried products that I can't absorb and digest them at all. Those things you eat are all fat. I often find a lot of big yellow things around me when I have a physical examination. In fact, that is fat. If you eat too much fat, it will pile up around me and make it difficult for me to twist. How can I absorb it if you don't wriggle? Without absorption, no nutrients will enter the body, and no nutrients will enter all cells of the heart and body through blood transportation. Then the human body will have no energy, no energy, no motivation, no motivation, and you can't live. After all, eating so much fat will hurt yourself. So I'm here to advise you to eat less fatty things in the future, because eating them will hurt yourself.

So in fact, I am very, very important. Isn't there another organ in your body called the brain? You say it is important because it contains many nerve cells, and those nerve cells can control our emotions, control our emotions, control our behavior, and even I am under his control. In fact, I also know that he is particularly important. If the human body can't think without a brain, then people are just a pool of meat, can't move at all, and there is no so-called IQ. Then in fact, I think I am no less than a brain, because if I don't absorb you, there will be no energy, and you will have no motivation and no way to live. And from the beginning, even before the brain evolved, I was already in your body. Because I need to digest and absorb, there will be many nerve cells in my body. These nerve cells can help me digest and absorb, making me a very important member of the digestive system. It is as important as the brain, so I can say it is your second brain.