According to the different physiological functions of each part, the digestive system can be divided into many organs, which are oral cavity (including teeth), esophagus, stomach, intestine, anus and digestive gland. Only by relying on the orderly division of labor and cooperation of these organs can the digestion process be successfully completed.
Gastrointestinal tract is called "the foundation of the day after tomorrow", which is the main organ for human body to digest and absorb food and ensure the nutrition needed by human body. If we compare the human body to a city, blood is its transportation system, and stomach is its biggest nutrition production center.
How does the gastrointestinal tract digest food? Food enters the stomach through human mouth. At this time, the stomach will secrete a large amount of pepsin. The food is preliminarily digested in a high-concentration acidic environment in the stomach, and some nutrients in the food are absorbed by the stomach at the same time.
The digestive system is also facing the same situation. People's own "pipes" are also carrying amazing kinds and quantities of things, and people hope that their drainage systems can take everything away. However, I'm afraid that human ducts don't always understand the strange things we eat, so human beings will have digestive problems.
The digestion of food can be divided into physical digestion and chemical digestion, which work at the same time. Physical digestion refers to tooth chewing, tongue stirring and gastrointestinal peristalsis, as well as emulsification of bile secreted by the liver.
Food is absorbed after digestion, and the stomach can absorb a small amount of water, a small amount of inorganic salts and a large amount of alcohol; Small intestine is the main place for food digestion and absorption, absorbing all glucose, amino acids, glycerol and fatty acids, as well as almost all vitamins, water and inorganic salts; The large intestine absorbs residual water and inorganic salts. If harmful substances are absorbed too much, it will have a bad influence on our health.