<qa>  What is the purpose of the study?Aim 2: To test the hypothesis that obesity elicits altered endothelial-dependent EDD and functional vasodilation due to altered functional potassium channel signaling. The investigators propose that potassium K channel function accounts for unexplained differences in EDD and functional vasodilation. More specifically, the investigators hypothesize that inhibition of K mediated hyperpolarization Inward Rectifying K channels-KIR will identify differential vasodilator mechanisms between lean and obese adults. 