The stomach can secrete digestive juices and the stomach wall can peristalsis, so the stomach can play a certain role in digesting food.
The stomach is a very important organ in the human digestive system, including four parts: cardia, body, fundus and pylorus. Food is chewed and stirred in the mouth, and starch is initially broken down under the action of salivary amylase, and then enters the stomach through the cardia for further digestion in the stomach.
Food digestion in the stomach, on the one hand, rely on the mechanical power of the stomach, the smooth muscle layer of the stomach wall has a good peristaltic function, the fold structure of the gastric mucosa can grind the food, these anatomical features contribute to the digestion of food in the stomach.
On the other hand, it relies on the chemical action of gastric juice for the digestion of food. The stomach secretes pepsinogen and gastric acid, which activates pepsinogen to form pepsin, which digests and breaks down protein substances. Large proteins can be broken down into peptides, amino acids, and so on.
In short, the physiological role of the stomach is to mix the food and digestive juices, and the food is digested into semi-liquefied chyme, which is sent to the small intestine for further digestion and absorption.