DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Foetal kidney. Light micrograph of a longitudinal section through a kidney from a human foetus. The cortex (dark pink) of the kidney consists mainly of blood vessels and filtering units. The filtering units are made up of a glomerulus (purple spheres) surrounded by a Bowman's capsule (white). The core of each glomerulus is formed of a tightly coiled capillary. Its function is to filter waste products from the blood. These drain through the proximal convoluted tubules (red, surrounding glomerulus) and loops of Henle in the renal pyramids (pink) into collecting ducts (purple ovals). The waste leaves the kidney, as urine, through the renal pelvis (pale pink, upper right). Magnification: x2 when printed at 10 centimetres tall.
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