Coronaryblood flow is increased by all of the following except: (A) Beta adrenergic blockade, (B) A decrease in aerial po2, (C) An increase in aerial pCO2, (D) Vagal stimulation
Answer is A. Beta adrenergic receptors causes karana vasodilation to increase CBF Blockage of these receptors causes decrease in the CBF Ref: page no 366 Textbook of physiology Volume 1 AK Jain 7th edition