Most potent vasoconstrictor of the pulmonary aery is:
Endothelin, urotensin, angiotensin are the potent constrictors of the systemic vessels. In case of the pulmonary vessels, hypoxia is the strongest vasoconstrictor, acting the O2-sensitive K+ channels in the pulmonary vascular smooth muscle cells (VSMCs).
Endothelin
Hypoxia
Angiotensin
TXA2
Respiratory System Pa 1