Which of the following causes vasodilation in the pulmonary circulation?
Substances producing pulmonary vasodilation include nitric oxide, prostacyclins, a2 and b2 adrenergic stimulation, histamine etc. Hypercapnia, hypoxy endothelin I, a1 adrenergic, angiotensin II, thromboxane produce pulmonary vasoconstriction.
Hypercarbia
Hypoxia
PGE
PGI