<prompt> Which is the most appropriate definition of Spare receptors ?The receptors which remain unoccupied even after drug produces maximal responseThe receptors for binding of Inverse agonistThe receptors that produce adverse drug effectsThe receptors that are unable produce maximum response  <response>: Spare receptors : Receptors that are still left unoccupied , even with a concentration of agonist that produces maximal biological response. e.g Myocardial cells are said to contain a large propoion of spare b adrenoceptors. 