The organ that is behind the belly button is the small intestine. It is part of the body's digestive system. More »

An infected appendix usually causes pain in the lower right side of the abdomen, according to Healthline. However, some patients have pain in the upper and lower abdomen, back and rectum, reports WebMD. More »

The small intestine's job is to absorb about 90 percent of the nutrients we consume, according to InnerBody. The small intestine is about an inch wide and approximately 10 feet long and is folded along itself in the abdo... More »

A mixture of food, liquid and digestive juice called chyme enters the small intestine from the stomach and combines with secretions such as enzymes, bicarbonate and bile salts to further break down food, according to the... More »

The small intestine in an adult human is around 20 feet long. The large intestine in a human averages around 5 feet long. More »

www.reference.com Science Human Anatomy Organs

The colon, also referred to as the large intestine, removes excess nutrients to form stools and transports this product to the rectum. This organ is part of the digestive system and is essential in the removal of waste. More »

In humans, the small intestine is about 20 feet long, and the large intestine is about 5 feet long. Both are situated in the abdomen and form a continuous tube from the stomach to the anus. More »