<P> The duodenum is the first section of the small intestine in most higher vertebrates , including mammals , reptiles , and birds . In fish , the divisions of the small intestine are not as clear , and the terms anterior intestine or proximal intestine may be used instead of duodenum . In mammals the duodenum may be the principal site for iron absorption . </P>
<P> The duodenum is the first section of the small intestine in most higher vertebrates , including mammals , reptiles , and birds . In fish , the divisions of the small intestine are not as clear , and the terms anterior intestine or proximal intestine may be used instead of duodenum . In mammals the duodenum may be the principal site for iron absorption . </P>
the organ located within the duodenal loop in the mammal is
the organ located within the duodenal loop in the mammal is
small intestine
small intestine