The stomach is a part of the digestive system of human beings and vertebrates, and it is an organ for storing and digesting food. The stomach mainly grinds large pieces of food into small pieces, and degrades macromolecules in food into smaller molecules for further absorption.
Gastrointestinal tract is mainly controlled by central nervous system (CNS) and enteric nervous system (ENS). Although enteric nervous system is controlled by the central nervous system, it has an independent reflex arc, which has the function of integration and can directly receive all kinds of information in the gastrointestinal tract.
It can be said that it is a relatively independent system, which participates in the regulation of gastrointestinal function; At the same time, the number of nerve cells in the digestive tract wall is second only to that in the brain, so ENS is called the brain of the intestine.
Extended data
After food enters the stomach, the intragastric pressure gradually increases, intermittently pushing chyme into the pylorus. Acid chyme stimulates intestinal mucosa after entering pylorus, inhibits gastric movement through nerves and body fluids, and stops excretion.
When acidic chyme is neutralized by alkaline liquid in duodenum, the inhibitory effect on gastric motility is released. During emptying, the pyloric sphincter limits the amount of food discharged each time to prevent the contents of the small intestine from flowing back into the stomach.
Generally speaking, it takes only 65,438+00 minutes for water to empty from human stomach, more than 2 hours for sugar food, slower for protein, slower for fat, and 4-5 hours for mixed food.
References:
Baidu encyclopedia-stomach