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What stimulates secretin?...

What stimulates secretin?

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**Step-by-Step Solution:** 1. **Identify the Source of Secretin**: Secretin is a digestive hormone that is secreted by the wall of the upper part of the small intestine, specifically the duodenum. 2. **Understand the Composition of Secretin**: Secretin is a polypeptide hormone, which means it is made up of a chain of amino acids. In this case, secretin consists of 27 amino acids. 3. **Determine the Stimuli for Secretin Release**: The release of secretin is primarily stimulated by the presence of gastric acid in the duodenal lumen. This occurs when acidic chyme from the stomach enters the duodenum. ...
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