Final answer:
True, Iron is absorbed by enterocytes in the duodenum via active transport into ferritin-bound complexes, regulated based on the body's requirements.
Step-by-step explanation:
True, iron is absorbed by enterocytes in the duodenum of the small intestine. This process involves the conversion of iron from ferric (Fe³⁺) to ferrous (Fe²⁺) form, aided by an acidic pH and reducing substances such as ascorbic acid. Once ferrous iron enters mucosal cells via active transport, it binds to the protein ferritin to form iron-ferritin complexes for storage. The body regulates the absorption of iron based on current needs, with mechanisms in place to increase uptake during states of deficiency such as chronic bleeding or menstruation in females.
Vitamin B12 and bile salts are absorbed in the ileum, while water and lipids are absorbed throughout the small intestine, including the duodenum, jejunum, and ileum. Minerals, in general, are absorbed regardless of need, with the notable exceptions of iron and calcium, which are absorbed according to bodily requirements.