This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
All of the following are true regarding the actions of endothelin-1 except ? 
Select and explain. 
A. Bronchodilation, B. Vasoconstriction, C. Decreased GFR, D. Has inotrophic effect
A: Bronchodilation
Answer: A: Bronchodilation 
Explanation: Endothelin-1 Potent vasoconstrictor agent Produced by endothelial cells. They are secreted locally and act in a paracrine fashion. Actions of Endothelin-1 (ET-1) Potent vasoconstrictor Platelet activation Inotrophic effect Closure of ductus aeriosus Have a role in the pathogenesis of hypeension, myocardial infarction, and congestive hea failure. In the brain, regulate the transpo of substances across blood brain barrier (BBB).. In the kidneys, they are involved in tubuloglomerular feedback- decreased GFR In the lungs, it causes bronchoconstriction (mediated ET-B receptors) In GIT, they are involved in the migration of myenteric plexus to distal colon (failure leads to Hirschsprung&;s/ Megacolon) Deletion of both alleles of ET-1 gene- craniofacial abnomalities and respiratory failure at bih. Ref: Ganong&;s Review of Medical Physiology 26th edition PGno: 584