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The primary role of hydrochloric acid is to sterilize the food you eat and to prevent harmful bacteria from entering the GI tract. HCL also triggers the release of enzymes such as pepsin which are essential for the digestion of protein.
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(i) Kills ingested bacteria.

(ii) Provides acidic medium for protein digestion.

(iii)Prevents putrefaction of food in stomach.

(iv)HCl splits nucleoproteins into nucleic acids and proteins.

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