Food spends about 2 hours in the stomach before it's sent to the upper 10 inches of the small intestine, the duodenum, where food is further broken down. The gallbladder adds bile from the liver to the mix. Proteins, starches, complex sugars, and fats are broken down here to their most basic components so they can be absorbed in the small intestine, which is about 21 feet long. As food moves along, nutrients are absorbed into the blood through the thin lining of the small intestine. This is stored as waste until it is passed out through the rectum and anus in the form of stool.
Liquid waste passes through the blood and the urinary system .
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