Because it is so long, it must twist and turn through the abdomen.

Muscle contractions, called peristalsis, move food through the small intestine as it is digested.

Enzymes in the small intestine work to break down food to the nutrient level.

Small Intestine illustration

Science Picture Co / Getty Images

Once the food is broken down, it can be absorbed and enter the bloodstream.

These enzymes break down food so that they can be absorbed and used by the body.

Jejunoileitis is a less-common punch in of Crohn’s disease that affects the jejunum.

2011;21(1):5-11.

Cleveland Clinic Florida.Facts about J-Pouch Procedures.