Our stomach secrets HCl or HA or Hydrochloric acid as a part of digestive process. It is a very powerful corrosive acid which is used in science laboratories for experiments.
It is also used for treating metals. The stomach secrets this powerful acid and still the stomach is intact. Have you wondered why?
Well, answer is: mucous lining in the stomach wall retains the acid within digestive system. And protect the stomach, stomach lining will grow every three to four days.
If it did not – imagine what would have happened?
Strong acid in the stomach would also digest the stomach!!