what are the three parts of the renal tubule?
['Proximal convoluted tubule (lies in cortex and lined by simple cuboidal epithelium with brush borders which help to increase the area of absorption greatly.)', 'Loop of Henle (hair-pin like, i.e. U-shaped, and lies in medulla) ... ', 'Distal convoluted tubule.', 'Connecting tubule.']