Which of the following component of gastric juice inactivates ptyalin?

Pepsin

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Mucus

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Rennin

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HCl

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Solution

The correct option is D HCl
Saliva contains a starch splitting enzyme ptyalin also known as salivary amylase which works around pH 6.8.
HCl of stomach is around pH 1-2 that inactivates the ptyalin.

Pepsin enzyme helps in digestion of protein.

Mucus lining in stomach protects the stomach wall from the acid.

Rennin enzyme coagulates milk protein in kids.

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