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The kidneys are bean-shaped organs that serve several essential regulatory roles in vertebrates. They remove excess organic molecules from the blood, and it is by this action that their best-known function is performed: the removal of waste products of metabolism. Kidneys are essential to the urinary system and also serve homoeostatic functions such as the regulation of electrolytes, maintenance of acid–base balance, and regulation of blood pressure.
Kidneys are main organs of urinary system. The basic unit of kidney is Bowmen's capsule. In it purification of blood occurs. Blood is purified and different toxic substances are removed from the blood.
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