kidney By Ivan Suarez Robles 10 Nov, 2010 An organ that plays a critical role in the excretory system; it is responsible for generating urine.Related Articles: A Case Study: Pregnancy and Symptomatic Huntington DiseaseGlossary: adrenal glandsHuntingtin Protein and Protein AggregationThe HOPES Huntington's Disease Timeline (Text)The Basic Neurobiology of Huntington's Disease (Text and Audio)