The small intestine is part of the gastrointestinal tract located between the stomach and large intestine. It is on average 6.9 meters long in adults and 2.5-3 cm in diameter. The small intestine is divided into three parts - the duodenum, jejunum, and ileum. The duodenum receives food from the stomach and digestive juices from the pancreas and gallbladder to aid in digestion. The jejunum is where most absorption of digested food takes place. The ileum further absorbs vitamins, minerals and remaining nutrients before the waste enters the large intestine.

2. part of the gastrointestinal tract
following the stomach and
followed by the large intestine
 where much of the digestion and
absorption of food takes place

4.  average length of the small
intestine
 in an adults- 6.9 m

5. It is approximately 2.5–3 cm in
diameter.

6. It is structurally divided into
three parts:
› duodenum
› jejunum
› ileum

7. .
The duodenum is a short structure
(about 20–25 cm long)
continuous with the stomach and
shaped like a "C".
 It surrounds the head of the
pancreas.

9. It receives gastric chyme from
the stomach, together with
digestive juices from the
pancreas (digestive enzymes)
and the gall bladder

14. Structure exhibits fingerlike or
leaflike villi
The duodenum contains Brunner's
glands, which produce a mucus-rich
alkaline secretion containing
bicarbonate.

15. The jejunum is the midsection
of the small intestine,
connecting the duodenum to the
ileum.

16. It is about 2.5 m long, and contains
the plicae circularis, and villi that
increase its surface area.
Products of digestion (sugars,amino
acids, and fatty acids) are
absorbed into the bloodstream
here

17. 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.
.

18.  The ileum joins to the cecum of
the large intestine at the
ileocecal junction

19.  Contains Peyers patches(aggregation of
lymphocytes)