The stomach is a part of the human digestive system, connected to the esophagus and the duodenum, and is located approximately in the upper left abdomen of the body, below the rib cage. The stomach is a pouch-shaped muscular cavity organ consisting of four parts: the cardia, fundus, body and sinus. The stomach has a capacity of only 50 ml when it is completely empty, while it can be in the shape of a balloon when it is highly filled, which is tens of times larger than before eating. According to ancestral medicine, the stomach is one of the six internal organs, also known as the gastric cavity. The upper cardia is connected to the esophagus and belongs to the upper filth; the lower pylorus is connected to the small intestine and belongs to the lower hospital; the upper and lower epigastric is between the middle epigastric. The stomach is the “sea of water and grain”, it can “ripen water and grain” (digest food) and promote the stomach’s capacity to descend (gastric emptying). The physiological function of the stomach is to regulate the balance of stomach yang and stomach yin. Stomach yang can provide warmth and heat, promote the contraction, diastole and peristalsis of the stomach, and facilitate the digestion of food into cereal. Stomach yin can nourish the stomach’s internal organs and restrain the hyperactivity of stomach yang. Due to the warmth of gastric yang and the nourishment of gastric yin, the stomach is able to complete the storage of food, transfer of chyme and initial digestion of food. To summarize, the main physiological function of the stomach is: storage of food, and through the peristalsis and gastric juice secretion, digestion of food: 1, accommodating food The stomach is connected to the esophagus and the intestinal tube, there is a role of the top and bottom, so that the food eaten regularly into the intestine. In fact, this process is intermittent, food from the esophagus into the stomach after stimulating the opening of the pyloric sphincter, gastric movement to strengthen the stomach pressure is greater than the duodenal pressure, the stomach contents can enter the duodenum. The gastric contents entering the duodenum pass through various receptors in the intestinal wall, reflexively causing weakening of gastric motility and slowing down of emptying, which plays an inhibitory role on gastric motility and emptying. When the hydrochloric acid entering the duodenum is neutralized and the digested food is absorbed, the inhibitory effect on the stomach gradually disappears and the stomach movement is gradually enhanced until another part of the stomach contents is discharged into the duodenum. Should take good care of our stomach In addition, different foods stay in the stomach for different periods of time. For example, water only stays for 2-3 minutes, carbohydrates (grains, fruits, nuts, etc.) for about 1-2 hours, proteins for about 2-3 hours, and fats take longer. Usually eating a variety of foods, it takes 4-5 hours to empty. If it is a high-fat eating leads to a long emptying time of the stomach, which may increase the burden on the stomach, stimulate the overproduction of gastric acid, leading to gastritis, gastric ulcers, etc.. Therefore, it is recommended to live a varied and reasonable diet, preferably light and easily digestible food, which is conducive to the emptying of the stomach. 2.Preliminary digestion The digestion of food by the stomach is divided into mechanical digestion and chemical digestion. Chemical digestion: Food is processed mainly by gastric juice composed of hydrochloric acid, pepsin and other chemical components. Pepsin provides the initial breakdown of protein components in food. Hydrochloric acid not only activates the proteasome, but also kills germs. Therefore, drinking a lot of water will dilute the stomach acid, and if you eat unclean food at this time, it will easily cause diarrhea. Similarly, the habit of using soup and water to soak rice is not beneficial. Mechanical digestion: The stomach digests food mechanically through movement. There are three main ways of stomach movement: accommodative diastole, tense contraction and peristalsis. About five minutes after the food enters the stomach, peristalsis begins, starting in the middle of the stomach body and gradually advancing toward the pylorus. Peristalsis is weak at the beginning, and the process of propagation is gradually accelerated and becomes more pronounced when approaching the pylorus. A portion of the chyme (the porridge-like substance in which the food is crushed) is pushed into the duodenum at a time. In the process of gastric movement will be crushed food and will be fully mixed with gastric juice, and finally form a semi-liquid mixture that can be easily absorbed by the small intestine. 3.Secretory function The stomach secretes a variety of substances. There are mainly gastric acid, pepsin and internal factors. The internal factor is a glycoprotein secreted by the gastric mucosa, which can combine with vitamin B12 to promote its contraction. That is why people who have undergone gastric resection are prone to suffer from vitamin B12 deficiency (causing symptoms such as pernicious anemia and menstrual disorders). All our daily behavioral activities require energy consumption, which is derived from the processing of food through the digestive system. The stomach is an important part of the body’s digestion and absorption. If the stomach does not work properly, then the whole digestive system will function abnormally and other organs of the body will also have problems. The stomach depends on nourishment, disease depends on prevention, only we love their stomach and intestines, pay attention to gastrointestinal disease prevention, good stomach, eating is good, the body is particularly good, sleep is particularly good!