Activation of which receptor causes pulmonary vasoconstriction?: (A) Alpha 2 adrenergic, (B) H2 histamine, (C) M3 cholinergic, (D) ETA epithelial receptor
Answer is D. Activation of ETA receptor causes pulmonary vasoconstriction. These are endothelin receptors.Ref: Ganong review of medical physiology, 23rd edition Page no: 609