<prompt> Which of the following is a physiological uncoupler?ThyroxineInsulinGlucagonNorepinephrine  <response>: Ans. A. ThyroxineRef: Harper 31e page 123Uncoupler of Oxidative PhosphorylationMechanism of Action -Disruption of Proton Gradient across the inner mitochondrial membrane.1. 2,4 Dinitrophenol2. Dinitrocresol3. FCCP Flouro Carbonyl Cyanide Phenyl hydrazine4. Aspirin in high dosePhysiological Uncoupler1. Thermogenin uncoupling Protein 1 in Brown Adipose Tissue2. Thyroxine3. Long chain free fatty acid4. Unconjugated bilirubin. 