<Ul> <Li> The duodenum is a short structure ranging from 20 cm ( 7.9 inches ) to 25 cm ( 9.8 inches ) in length , and shaped like a `` C '' . It surrounds the head of the pancreas . It receives gastric chyme from the stomach , together with digestive juices from the pancreas ( digestive enzymes ) and the liver ( bile ) . The digestive enzymes break down proteins and bile emulsifies fats into micelles . The duodenum contains Brunner 's glands , which produce a mucus - rich alkaline secretion containing bicarbonate . These secretions , in combination with bicarbonate from the pancreas , neutralize the stomach acids contained in gastric chyme . </Li> <Li> The jejunum is the midsection of the small intestine , connecting the duodenum to the ileum . It is about 2.5 m long , and contains the plicae circulares , and villi that increase its surface area . Products of digestion ( sugars , amino acids , and fatty acids ) are absorbed into the bloodstream here . The suspensory muscle of duodenum marks the division between the duodenum and the jejunum . </Li> <Li> The ileum : The final section of the small intestine . It is about 3 m long , and contains villi similar to the jejunum . It absorbs mainly vitamin B12 and bile acids , as well as any other remaining nutrients . The ileum joins to the cecum of the large intestine at the ileocecal junction . </Li> </Ul>
<Ul> <Li> The duodenum is a short structure ranging from 20 cm ( 7.9 inches ) to 25 cm ( 9.8 inches ) in length , and shaped like a `` C '' . It surrounds the head of the pancreas . It receives gastric chyme from the stomach , together with digestive juices from the pancreas ( digestive enzymes ) and the liver ( bile ) . The digestive enzymes break down proteins and bile emulsifies fats into micelles . The duodenum contains Brunner 's glands , which produce a mucus - rich alkaline secretion containing bicarbonate . These secretions , in combination with bicarbonate from the pancreas , neutralize the stomach acids contained in gastric chyme . </Li> <Li> The jejunum is the midsection of the small intestine , connecting the duodenum to the ileum . It is about 2.5 m long , and contains the plicae circulares , and villi that increase its surface area . Products of digestion ( sugars , amino acids , and fatty acids ) are absorbed into the bloodstream here . The suspensory muscle of duodenum marks the division between the duodenum and the jejunum . </Li> <Li> The ileum : The final section of the small intestine . It is about 3 m long , and contains villi similar to the jejunum . It absorbs mainly vitamin B12 and bile acids , as well as any other remaining nutrients . The ileum joins to the cecum of the large intestine at the ileocecal junction . </Li> </Ul>
where does most absorption take place in small intestine
where does most absorption take place in small intestine
The jejunum
The jejunum