The document discusses the kidney and its functions. The kidney filters waste from the blood and regulates fluid balance and electrolyte levels in the body. It removes waste from the blood in the form of urine and excretes it from the body. The kidney also helps regulate blood pressure and produces hormones that help make red blood cells and activate vitamin D.

1. The Kidney (AHL)
Stephen Taylor
i-Biology.net
Image from http://www.biologymad.com/resources/kidney.swf

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45. @IBiologyStephen
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