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Q.

HCl of gastric juice

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a

inactivates ptyalin and activates pepsin

b

activates ptyalin and inactivates pepsin

c

inactivates both ptyalin and pepsin

d

activates both ptyalin and pepsin

answer is A.

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Detailed Solution

HCl does not directly help in digestion. HCl of gastric juice inactivates ptyalin and activates pepsin. It converts proenzyme prorennin and pepsinogen into active rennin and pepsin respectively by lowering the pH of stomach between 1.5 - 2.5. HCl acidifies the food and stops the action of ptyalin.

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