Which segment of the small intestine primarily receives chyme from the stomach and neutralizes its acids before they can damage absorptive surfaces?

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The duodenum handles the immediate post-stomach challenge by receiving chyme and neutralizing its acids to protect the absorptive surfaces. As chyme enters from the stomach, the duodenum mixes it with bicarbonate-rich secretions from the pancreas and alkaline mucus from Brunner’s glands. This neutralizes the gastric acid, raising the pH to a level suitable for digestive enzymes to work without damaging the mucosa. Secretin released in response to acidity stimulates the pancreas to add more bicarbonate, reinforcing this neutralizing action. Beyond protection, this setup also creates the right environment for digestion to proceed. The jejunum and ileum are mainly for absorption, while the cecum is part of the large intestine, not the small intestine.