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IF you mean the "duodenum" its the first part of the small intestines where the dissolved food from the stomach is MIXED with the bile salts and the pancreatic secretions.
the body of the stomach
The stomach the stomach the stomach's job is to churn and mixed and digest food until it's a liquid.
stomach, small intestine
The secretions of the stomach are acidic. The acid is too strong than you can imagine. The pH is as low as 2. The secretions of the stomach remain acidic till the mid-part of the second part of the duodenum. Here the alkaline secretions of the liver and the pancreas enter the duodenum to counter the acidic secretions of the stomach.
Segmentation is a muscle action that mixes chyme with digestive juices, while Peristalsis is a muscle action that moves food through the digestive system.
stomach
stomach
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The acid in your stomach.
stomach
stomach