Excretory System
Excretory systems are special structures in organism through which waste products of metabolism are rid and the proper balance of water and salts in the blood and other body fluids is maintained at the same time. Detection is the elimination of undigested material from the body and is a function of the digestive system.
The major excretory organs in vertebrates are the kidneys, which are two paired organs, one on each side of the body. The kidneys and associated organs that store and eliminate urine are collectively called the urinary system. The kidneys dispose of toxic wastes, such as ammonia, urea and uric acid, and excess salt and water in the form of urine. The heart, in a sense, pumps blood blindly, but the kidneys monitor the quality of blood so that the organism is not poisoned by the end products of its own metabolism and the proper volume and composition of its body fluids are maintained.
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