Mean arterial blood pressure can be regulated by changing which of the following? 1. Capacity of the circulatory system 2. Effective volume of circulating blood 3. Tone of the capacitance vessels (veins)
a. 1 and 2 only
b. 2 only
c. 1, 2, and 3
d. 3 only
ANS: C
All else being constant, mean arterial pressure is directly related to the volume of blood in the vascular system and inversely related to its capacity. A change in the tone of the capacitance vessels alters their capacity.
Mean arterial pressure = volume/capacity.
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