Final answer:
Endothelin and other vasoconstrictors inhibit hypoxic pulmonary vasoconstriction by constricting the blood vessels in the lungs.
Step-by-step explanation:
Endothelin is a powerful vasoconstrictor that inhibits hypoxic pulmonary vasoconstriction. It is produced by endothelial cells and is released in response to hormones such as angiotensin II, bradykinin, and epinephrine. Endothelin constricts the blood vessels in the lungs, reducing blood flow to areas of low oxygen levels.
Other vasoconstrictors that can inhibit hypoxic pulmonary vasoconstriction include prostaglandins, platelet secretions, and certain hormones.