The last portion of the small intestine is the ________.

A) ileum
B) jejunum
C) duodenum
D) none of the above

Ileum

The ileum is the final and longest segment of the small intestine, where most of the nutrients from digested food are absorbed.

Jejunum

The middle section of the small intestine in mammals, between the duodenum and ileum, where the absorption of nutrients and minerals occurs.

Duodenum

The first section of the small intestine, immediately following the stomach, where significant chemical digestion occurs.