College Answer

Good answers to this question were those that had a tabular format to the structure of the answer — for example columns headed mechanism, sites, drug and side effects. Most  common omissions were not to further describe how the different mechanisms of action of diuretics increased urine output, e.g. "disruption of the counter current multiplier system by decreasing absorption of ions from the loop of Henle into the medullary interstitium, thereby decreasing the osmolarity of the medullary interstitial fluid". There was often little mention of increased urine solutes and the effect the electro chemical effect had in promoting a diuresis. Examples of drugs were well done.