Kidney glomeruli. Coloured scanning electron micrograph (SEM) of tissue from a healthy kidney, showing the glomerular structure. The surface of a glomerulus is encased in podocyte cells (brown and green). These have branching processes (pedicles) that interlock. Below the surface, blood flows through the coiled capillary that is the core of a glomerulus. The function of the glomeruli is to filter waste products from the blood. Filtration occurs through the narrow slits between the interlocking pedicles. After the reabsorption of certain substances elsewhere in the kidney, the liquid is transported to the bladder as urine. Magnification: x3000 at 10 centimetres wide.