A polypeptide that is secreted into the blood by the cells in the stomach wall, stimulates the production of HCl by the parietal cells of the stomach is

Gastrin

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Secretin

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Pancreozymin

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Renin

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Solution

The correct option is A Gastrin
Gastrin is a peptide hormone, that stimulates secretion of gastric acid ( $H C l$ ) by the parietal cells of the stomach and helps in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum, and the pancreas.

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