Coronary blood flow, true is: (A) 250ml/min, (B) Maximum during systole, (C) Adenosine decreases it, (D) More than skin
Answer is B. Coronary flow at rest in humans is about 250 mL/min (5% of the cardiac output).Consequently, flow occurs in the aeries supplying the subendocardial poion of the left ventricle only during diastoleAdenosine cause coronary vasodilation and decrease flowCutaneous blood flow is about 10-15 mL/min/cutaneous tissue whereas in hea it is 70mL/100g tissue/minRef: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:578