2, gastric juice: pepsin?

3, intestinal juice

(1) Small intestinal juice: It is an enzyme that digests food, and contains aminopeptidase, sucrase, lactase, maltase, nucleic acid lyase, lecithin enzyme, etc. It also contains phospholipase.

(2) Duodenal fluid: contains pepsin, which has the functions of coagulating, decomposing fat and starch. It also contains enterokinase that activates trypsinogen in pancreatic juice;

(3) Colorectal fluid: odorless viscous liquid, generally neutral, containing digestive enzymes such as aminopeptidase, dipeptidase and amylase, which is secreted by mechanical stimulation and plays a role in the transportation of contents and the formation of feces.

Step 4 be angry

Bile has no digestive enzymes, and digestion mainly depends on bile salts. Bile salt can also activate pancreatic lipase. It can also be combined with fatty acids and fat-soluble vitamins to form water-soluble complexes to promote the absorption of these substances.

Extended data

The role of saliva:

1, saliva can promote blood coagulation, and oral trauma or bleeding after tooth extraction can help stop bleeding.

2, lubrication: saliva contains mucin, which can make the mouth smooth and soft.

3, washing function: can wash away food residues, keep the mouth clean and hygienic.

4, dilution: when acid, bitterness and other irritating things enter the mouth, saliva secretion increases, dilute it, easy to spit or swallow.

5. Antibacterial effect: Various organic and inorganic components in saliva have certain antibacterial effect through different mechanisms, which can prevent inflammation of mouth, throat and gums.

6. Therapeutic effect: There is a nerve growth hormone in saliva, which can significantly shorten the wound healing time and accelerate the healing of burned skin.

7. Digestion: Saliva contains a lot of amylase, which can hydrolyze starch into maltose, making it easy to be absorbed.

8. Anti-aging effect: Saliva contains a "salivary parotid hormone" that can keep people young. It can make people smart, have firm teeth and strong muscles, and make people blush even when they are old, without reducing their youthful vitality.

9. Anti-cancer effect: According to the research results of the University of Georgia, carcinogenic aflatoxin and nitrite will be diluted and inhibited after 30 seconds of contact with saliva. In other words, saliva has a strong anti-cancer effect and is also a natural anti-cancer agent.

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