Scanning electron micrograph of glomerulus and proximal tubules. The proximal tubule is the portion of the duct system of the nephron of the kidney which leads from Bowman's capsule to the loop of Henle. The glomerulus is a cluster of capillaries around the end of a kidney tubule, where waste products are filtered from the blood. Supplied by David Gregory & Debbie Marshall, courtesy of Wellcome Images.