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This Concept Map, created with IHMC CmapTools, has information related to: Counter current, ascending limb is impermeable to water, Loop of Henle & vasa recta ???? descending limb, impermeable to water transport of water by osmosis, vasa recta in opposite direction with ascending & descending loop of Henle, descending limb is permeable to water, passive transport at thin segment, Loop of Henle & vasa recta ???? ascending limb, Loop of Henle & vasa recta ???? collecting duct, collecting duct diffusion of urea, permeable to water transport of sodium & chloride by passive transport, Loop of Henle & vasa recta ???? vasa recta, permeable to water transport of sodium & chloride by active transport, Loop of Henle & vasa recta 1. starts with loop of Henle, active transport at thick segment, impermeable to water with ADH is facilitated transport, Explain the countercurrent multiplier mechanism in controlling urine concentration [12 marks] focuses on Loop of Henle & vasa recta, ascending & descending loop of Henle reabsorbed back into blood stream, collecting duct usually impermeable to water, urea to maintain osmolarity at intersitial tissues, loop of Henle where filtrate has highest osmolarity