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The great journey in which food turns into well, you know, starts in the stomach, where food is broken down into a mostly liquid substance called chyme.
It continues in the small intestine, where the nutrients are absorbed. It ends in the large intestine, where the remaining water is reabsorbed, certain electrolytes and vitamins are absorbed, and the final fermentation occurs and the chyme becomes feces.
The large intestine is approximately 4.5 feet long, and consists of four main sections: the cecum (where the small intestine joins, and the appendix is attached), the colon, the rectum and the anal canal.