Absorption Sites of absorption
Absorption consists primarily of the transfer of nutrients from the lumen of the small intestine through the intestinal epithelium into the lamina propria, where the nutrients enter the blood and lymph vessels. Although limited amounts of water, alcohol, simple salts, and glucose are absorbed through the gastric mucosa, the small intestine is by far the more important organ for absorption. The most active absorptive area in the small intestine is the lower part of the duodenum and the first part of the jejunum.