Pulmonary Vasoconstriction & Inhaled Vasodilators

a) Describe the physiological factors that contribute to pulmonary vasoconstricton. Include the mechanisms involved in your answer (60% of marks). b) For each of the inhaled pulmonary vasodilators, nitric oxide and prostacyclin: i) describe the mechanism(s) of action (25% of marks) ii) outline the adverse effects (15% of marks).