Pepsin Secretion Coefficient:
The stomach has two kinds of duct glands, wherein one is gastric gland which mainly secretes digestive juice and the other is cardiac gland which mainly secretes mucus to protect the mucosa of the cardia. The gastric gland is consist of three kinds of cells: mucous neck cells, chief cells and parietal cells, wherein the mucous neck cells secrete mucus and are located on the surface and below the cortex; the chief cells secrete digestive juice and are located in the middle of the glands and below the neck mucous cells, and the digestive juice mainly includes pepsin; the parietal cells secrete hydrochloric acid, namely the so-called gastric acid, and they are located at the bottom of stomach closing to the cardia, containing many small ducts communicated with the glandular cavity.
Gastric Peristalsis Function Coefficient:
There are oblique, circular and longitudinal smooth muscles on the gastric wall, and their contraction and relaxation make the stomach have the capability of peristalsis. Gastric peristalsis grinds the food for further processing as well as the role of gastric juice to make food into a gruel kind of chyme, and then the chime are ejected in the small intestines in batches through the pylorus. The time of processing food in the stomach is different. The processing time of carbohydrate foods is shorter than that of protein foods, and the processing time of fat and oil foods is longest, so we are not easy to hunger after eating meat and oily foods. The food is preliminarily digested by the gastric motion (peristalsis) and gastric juice (mucus, gastric acid, protease, etc.) secreted by the stomach to form a paste (chyme), and then enters the small intestines (including: duodenum, jejunum and ileum) after eating about 3-4 hours.