One of a pair of organs in the abdomen. Kidneys remove waste from the blood (as urine), produce erythropoietin (a substance that stimulates red blood cell production), and play a role in blood pressure regulation. The organs of the urinary tract located in the retroperitoneal cavity adjacent to the spine and composed of the renal cortex and the renal medulla. A paired organ of the urinary tract which has the production of urine as its primary function.
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