<prompt> The neurotransmitters; nor-adrenaline, adrenaline and dopamine act through which of the following receptors?Single pass transmembrane receptorsFour pass transmembrane receptorsSeven pass transmembrane receptorsLigand gated receptors  <response>: Ans. C Seven pass transmembrane receptorsRef: KDT 8the p54, 55These neurotransmitters A, NA, DA act through G-protein coupled receptors which are also known as seven-transmembrane domain receptors, heptahelical receptors and serpentine receptors. 