Malpighian Tubules

These little tubes are excretory organs serving as kidneys. Malpighian tubules remove nitrogenous wastes and salts produced during metabolism from the hemolymph. A hundred or more of these thread-like tubes join the alimentary canal where the intestine joins the stomach. The free ends of the tubes extend for long distances within the abdominal cavity, and like hoses, can move about within the spaces surrounding the organs. The hemolymph that washes over the organs enters the free open ends. Wastes move along the tubes to discharge into the intestine and are eliminated with the feces.

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