The longer of your two intestines, your small intestine is between 20 and 30 feet long and absorbs most of your food. There are three major sections of your small intestine which include:
Duodenum: Mixes semi-digested food with bile from your gallbladder, liver, and pancreas to break down food further.
Jejunum: Absorbs fatty acids, sugars, and amino acids.
Ileum: Absorbs most of the nutrients before passing food along to the large intestine.
The walls of the small intestine are responsible for water absorption and puts nutrients into the bloodstream. The muscles around the small intestine push digested food along the intestines, through a process called peristalsis.