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Kidney. Cross-section through a gross specimen of a kidney. The kidneys filter waste from the blood and excrete it as urine. The kidney consists of an outer pale cortex and an inner darker medulla. The medulla is divided into regions called the renal pyramids. Each renal pyramid drains into a renal papilla (white areas at centre). The renal papillae merge to form the ureter (bottom left), which carries the urine to the bladder.
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