<prompt> Which of the following are physiological antagonistsAdrenaline and Isoprenalineglucagon and insulinIsoprenaline and PropranololAll of the above  <response>: Adrenalin and histamine and glucagon, insulin are physiological antagonists Physiological antagonism - opp effect on the same physiological system by two drugs glucagon increases blood glucose, insulin decreases- blood glucose adrenaline- bronchodilatation histamine- broncho constriction Ref KD Tripathi 8th ed. 