Final answer:
The ileum of the small intestine absorbs iron and bile salts, along with other nutrients.
Step-by-step explanation:
The gastrointestinal (GI) system plays a crucial role in the absorption of nutrients from the food we consume. The process of absorption occurs primarily in the small intestine, where the majority of digestion takes place.
The structure of the GI system that absorbs iron and bile salts is the ileum. The ileum is the third and final part of the small intestine, and its main function is to absorb vitamin B12 and bile salts. It also absorbs any other remaining nutrients that were not absorbed in the jejunum.