Rat kidney glomeruli. Fluorescence deconvolution micrograph of a section through two glomeruli in the healthy kidney of a rat, showing their capillaries (green). Glomeruli are bundles of capillaries that filter waste products from the blood. After the reabsorption of certain substances elsewhere in the kidney, the liquid is transported to the bladder as urine. Magnification: x40 when printed 10 centimetres wide.