There is a special gland on human use of humans and other animals stomach, you can eat the salt into hydrochloric acid. Hydrochloric acid is a component of gastric juice (concentration of about 0.5%), which enables the juice remain active pepsin needed most suitable pH value, it can make salt in protein denaturation and susceptible to hydrolysis, and kill with food into the role of bacteria in the stomach. In addition, the hydrochloric acid into the small intestine, can promote pancreatic juice, intestinal fluid secretion and bile secretion and discharge, acidic environment also helps the intestinal absorption of iron and calcium. Daily use Preparation Toilet Cleaner, rust, etc. daily necessities. 

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