ren is the combining form for kidney which derives from Latin, the combining form for kidney which derives from Greek is Nephr/o.
Kidney is the main organ of the excretory system that is involved in the filtration of the blood and removal of wastes like ions, salts, waste fluid, etc. The basic unit of the kidney that actually performs all these functions is called a nephron. The kidney is a bean shaped structure which is present in a pair.
Several nephrons together form the kidney. Nephron itself has various components. These are: glomerulus within Bowman's capsule, a proximal convoluted tubule, an intermediate tubule (loop of Henle), a distal convoluted tubule, a connecting tubule, and the collecting duct.
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