In frogs, waste materials are excreted out in many ways e.g. skin, lungs, liver. digestive system. etc. It is the set of organs involved in the process of excretion--that is, the removal of metabolic waste- matters from the body. Besides these organs. nitrogenous waste materials are excreted through two kidneys, which are attached to the dorsal wall of the body cavity These are elongated in shape and composed of urinary tubules. Urinary tubules combine to form collecting ducts, which open into ureter. The urine collected by the kidneys comes into ureters. Each ureter starts from the edge of each kidney of its side and opens into cloaca. From here, the urine is excreted or stored in urinary bladder which is passed out of the body from the cloacal aperture. Carbon dioxide and water are excreted through skin and lungs while undigested food and some waste materials are excreted through liver and digestive system.
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