During shock due to blood loss, children can maintain their blood pressure for longer periods of time than adults can because they:
A. have a greater ability to increase myocardial contractility.
B. have a proportionately larger circulating blood volume.
C. rely exclusively on their heart rate to maintain perfusion.
D. have a smaller absolute blood volume than do adults.
Answer: B. have a proportionately larger circulating blood volume.
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