Kidney glomeruli. Coloured scanning electron micrograph (SEM) of glomeruli (green) and blood vessels (pink) in the human kidney. Glomeruli are made up of a tight knot of blood capillaries covered in podocyte cells. These tiny filtration units remove toxic waste products from the blood. The filtered fluid then drains to the bladder as urine. Magnification: x75 at 6x7cm size.
