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noun, plural: kidneys

Either of a pair of two bean-shaped organs located in the abdominal cavity in vertebrates, and functions by filtering bloodof wastes to be eliminated from the body in the form of urine, and regulating the level of certain chemicals for proper fluid balance in the body


The kidney is an organ in the body whose function is primarily for filtering the blood and producing urine. In humans, the kidneys are found in the upper posterior abdominal cavity where each of the pair is on either side of the vertebral column. The kidneys are shaped like a large bean. It is surrounded by renal capsule, which is in turn surrounded by adipose capsule, renal fascia, and pararenal fat. The functional (filtering and excretory) unit of kidney is called nephron. Filtration at the site of the glomerulus in the Bowmans Capsule while the loops of Henle are responsible for 'sucking up waste material to be excreted by the organism. Much of the water that is used in our bodies has already been reabsorbed at least once by our kidney.

The kidneys filter the blood and control the level of certain chemicals in the blood such as hydrogen, sodium, potassium, and phosphate. Thus, they are important in osmoregulation. And they are involved as well in waste elimination by forming urine. Urine passes out of the kidney via the ureters into the bladder. The bladder stores the urine until it is released during urination.

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