During periods of activity, when the heart rate is rapid, the mean arterial pressure in humans is
A) 2/3 diastolic pressure and 1/3 systolic pressure.
B) 1/3 diastolic pressure and 2/3 systolic pressure.
C) 1/2 diastolic pressure and 1/2 systolic pressure.
D) Approximately equal to systolic pressure.
Answer: C
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