Human blood,saliva,tears,bile,and urine are close to neutral.Why is human stomach acid very acidic?

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The stomach acid is very acidic because it has to break down the eaten polymers (proteins, fats, and carbohydrates) into their individual monomers (amino acids, fatty acids, and sugars) that can be absorbed and used by the body. The acidic environment of the stomach helps to unfold the proteins and expose their peptide bonds, which are then broken down by enzymes called proteases. Similarly, the acidic environment activates digestive enzymes that break down fats and carbohydrates.

Human Blood,saliva,tears,bile,and Urine Are Close to Neutral