Figure 1.

(a) Anatomy of a kidney, showing where one can find nephrons. Blood is supplied to the kidneys through the renal artery. (b) Structure of a single nephron. Filtration of blood occurs in the renal corpuscle. The renal artery splits into smaller vessels called arterioles, which form bundles of vessels inside the corpuscle called glomeruli. * PCT = Proximal Convoluted Tubule, the section of the renal tubule which is directly connected to the renal corpuscle. The whole of the tubules is surrounded by peritubular capillaries, which carry filtered blood from the glomeruli.