The device excretory is a set of organs in charge of the elimination of the nitrogenous residues of the metabolism, known by the medicine as urine; that it shapes the urea and the creatinina. His architecture consists of structures that leak the corporal fluids (liquid celomático, hemolinfa, bleeds). In the invertebrates the basic unit of filtration is the nephritis, whereas in the vertebrates it is the nefrona or nefrón. The urinary human device consists, fundamentally, of two parts that are:
* The organs secretors’: kidney, which produce the urine and other functions recover
* The route excretory that gathers the urine and expels her on the outside.
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