Which hormone is produced mainly in the stomach and regulates secretions of gastric juice? the choices are: gastrin. . secretin. . pepsin.

Gastrin.

Explanation:

The gastrin is the peptide hormone which aids in the process of digestion of food. It's function is to stimulate the secretion of gastric acid through the parietal cells of the stomach. It also aids in gastric motility.

The G cells like pyloric antrum of the stomach, pancreas and duodenum are the cells which also secrete the gastrin hormone.  

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