Explain about small intestine?

The small intestine or small bowel is the part of the <a href="https://en.m.wikipedia.org/wiki/Human_gastrointestinal_tract" title="Human gastrointestinal tract">gastrointestinal tract</a> between the <a href="https://en.m.wikipedia.org/wiki/Stomach" title="Stomach">stomach</a> and the <a href="https://en.m.wikipedia.org/wiki/Large_intestine" title="Large intestine">large intestine</a>, and is where most of the end absorption of food takes place. The small intestine has three distinct regions – the <a href="https://en.m.wikipedia.org/wiki/Duodenum" title="Duodenum">duodenum</a>, <a href="https://en.m.wikipedia.org/wiki/Jejunum" title="Jejunum">jejunum</a>, and <a href="https://en.m.wikipedia.org/wiki/Ileum" title="Ileum">ileum</a>. The <a href="https://en.m.wikipedia.org/wiki/Duodenum" title="Duodenum">duodenum</a> is the shortest part of the small intestine and is where preparation for <a href="https://en.m.wikipedia.org/wiki/Small_intestine#Absorption">absorption</a> begins. It also receives <a href="https://en.m.wikipedia.org/wiki/Bile" title="Bile">bile</a> and <a href="https://en.m.wikipedia.org/wiki/Pancreatic_juice" title="Pancreatic juice">pancreatic juice</a> through the <a href="https://en.m.wikipedia.org/wiki/Pancreatic_duct" title="Pancreatic duct">pancreatic duct</a>, controlled by the <a href="https://en.m.wikipedia.org/wiki/Sphincter_of_oddi" title="Sphincter of oddi">sphincter of Oddi</a>. The primary function of the small intestine is the absorption of <a href="https://en.m.wikipedia.org/wiki/Nutrient" title="Nutrient">nutrients</a> and <a href="https://en.m.wikipedia.org/wiki/Mineral" title="Mineral">minerals</a> from food, using small finger-like protrusions called <a href="https://en.m.wikipedia.org/wiki/Intestinal_villus" title="Intestinal villus">villi</a>.