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Unformatted text preview: excretion- gets rid of harmful substances transport in nephron - osmotic gradient needed for reabsorption proximal convoluted tubule- active transport of Na+ and Cl- >> reabsorption o most of water reabsorbed through wall of collecting duct o leaves behind hypertonic urine loop of Henle- creates the hypertonic renal medulla that draws water out from nephrons o water permeates through descending limb o water stays through ascending limb, NaCl leaves antidiuretic hormone (ADH) - aka vasopressin o produced by hypothalamus, secreted by posterior pituitary gland o more ADH >> less water in urine o less ADH >> more water in urine aldosterone - maintains the Na+ levels (reabsorption), consequently water levels o opposed by atrial natriuretic hormone (promotes excretion of salt/water)...
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- Fall '10