Main function of HCl in stomach is to

Activates amylase enzyme

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Facilitate absorption of food

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Dissolve enzymes

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Activate pepsinogen to pepsin

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Solution

The correct option is D Activate pepsinogen to pepsin
Stomach in vertebrates is the main site for digestion of proteins. Pepsin is the chief proteolytic enzyme of stomach secreted in the inactive form called as pepsinogen. The pepsinogen is activated to pepsin in presence of hydrochloric acid secreted in stomach by oxyntic or parietal cells. The optimum pH for activity of pepsin is 1.8.
Therefore, the correct answer is option D.

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