What substances are part of gastric juice? What are their functions?

Gastric juice is a colorless liquid that contains digestive enzymes, mucus, and a 0.5 percent solution of hydrochloric acid (HCl). It activates the enzymes of gastric juice and destroys pathogens. The leading role in the digestion of food in the stomach cavity is played by the enzyme pepsin, which turns complex protein molecules into relatively simple ones. The lipase contained in the gastric juice breaks down emulsified milk fats into glycerol and fatty acids.

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