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Old 01-03-2013
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Default NBME 3 Question 35

Question essentially asking which metabolite would cause vasoconstriction of coronary vessels.
choices were Adenosine, NO, Oxygen, Prostacyclins, NE

I've seen online answers saying NE causes vasoconstriction of the coronary vessels.

BRS physio says otherwise.
Sympathetic control is the least important mechanism with regards to coronary circulation. While local metabolic control is most important.

Would the answer be oxygen?

Adenosine, NO, and Prostacyclines all have direct actions to cause vasodilation.

Does someone know mechanism of Oxygen on coronary vessels?
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