Which of the following equations best depicts the factors determining mean arterial blood pres-sure?
a. Mean arterial pressure = cardiac output ÷ vascular resistance
b. Mean arterial pressure = cardiac output ? vascular resistance
c. Mean arterial pressure = right atrial pres-sure ? aortic pressure
d. Mean arterial pressure = vascular re-sistance ÷ cardiac output
ANS: B
Average blood pressure in the circulation is directly related to both cardiac output and flow re-sistance.
Mean arterial pressure = cardiac output ? vascular resistance.
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