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The colon is about six feet long and is the part of the body's digestive system that moves waste material from the small intestine to the rectum. The small intestine sucks the nutrients out of what you eat and then pours the leftover sludge into the cecum. This sludgy waste then moves from the cecum to the colon for further processing.
The small intestine is the part of the gastrointestinal tract (gut) following the stomach and followed by the large intestine, and is where the vast majority of digestion and absorption of food takes place
The appendix or cecal The appendix secretes antibodies into the gut and so plays a role in the body's immune system.