<prompt> Physiological antagonism is found in ?Isoprenaline and salbutamolIsoprenaline and adrenalineIsoprenaline and propranololAdrenaline and histamine  <response>: Ans. is d i.e., Adrenaline and histamine Physiological antagonists o Physiological antagonists are those that produce opposite action by acting on different receptors. Example 1.Histamine causes bronchoconstriction H1 receptors and this action is antagonized by adrenaline which causes bronchodilodation through 132 receptors option d 2.Leukotrienes cause bronchoconstriction cystinyl leukotriene receptors and this action is antagonised by salhutamol which causes bronchodilatation through 132 receptors option e Receptor antagonists Pharmalogical antagonists Receptor antagonists are those drugs that blocks the action of agonist by acting on same receptors. Example 1. Isoprenaline is 131 and p, receptor agonist while propranolol has antagonistic action on 13, and 02 receptors option c about option a and b o Adrenaline a, R weak 33 agonist, isoprenaline 0, 02 13, agonist and salbutamol 13., agonist -- all three are sympathomimetic drugs not antagonists 