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The intestines are a long continuous tube running from the stomach to the "BEEP". Most absorption of nutrients and water happen in the intestines. The intestines include the small intestine, large intestine, and rectum.
The small intestine (small bowel) is about 20 feet long and about an inch in diameter. Its job is to absorb most of the nutrients from what we eat and drink. Velvety tissue lines the small intestine, which is divided into the duodenum, jejunum, and ileum.
The large intestine (colon or large bowel) is about 5 feet long and about 3 inches in diameter. The colon absorbs water from wastes, creating stool. As stool enters the rectum, nerves there create the urge to defecate.
Alright, time to get even nerdier!
spleen is an organ above the stomach and under the ribs on the left side. It is about as big as your fist. The spleen is part of the lymphatic system, which fights infection and keeps the body fluids in balance.
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