Pulmonary vasoconstriction is caused by all except
Correct Answer: Prostocyclin
Description: Prostacyclin is produced by endothelial cells and thromboxane A2 by platelets from their common precursor arachidonic acid the cyclooxygenase pathway. Thromboxane A2 promotes platelet aggregation and vasoconstriction, whereas prostacyclin inhibits platelet aggregation and promotes vasodilation.Ref: Ganong review of medical physiology 23rd edition Page no: 563
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