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Excretion is disposal of waste matter from the body. In the human body, the main excretory organs are the kidneys, the skin and, to a lesser degree, the intestines. The reason the principal excretory organs are not the intestines is that the vast majority of the contents of the stool was never in the body in the first place. The gastrointestinal tract is actually outside the body per se. However, a small portion of the fecal matter contains actual waste material from the inside of the body. This is primarily the bile, which is formed in the liver, passes into the gallbladder, and thence into the intestines via the bile duct. The importance of the excretory system is that waste, if not disposed of, would poison the body.

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