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QUESTION
Q354) HCl of gastric juice .. [ KCET 2002 ]

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The parietal cells secrete hydrochloric acid (HCl), which lowers the pH of the gastric juice (water + enzymes + acid). The HCl inactivates salivary amylase (ptyalin) and catalyzes the conversion of pepsinogen to pepsin.
Answer : (a)