Answer
b.
Work Step by Step
During systole, the ventricles contract, causing blood to flow at high pressure into the arteries. During diastole, both atria and ventricles relax, which allows them to fill with blood. The first number, the numerator, is the systolic pressure. The second number, or denominator, is the diastolic pressure. In Paul's case, his systolic pressure is 150, and his diastolic pressure is 90.
