1. “Blood pressure” refers to the arterial pressure of the systemic circulation.
ID: 1473085 • Letter: 1
Question
1. “Blood pressure” refers to the arterial pressure of the systemic circulation. There are two parts, the systolic (maximum) and the diastolic (minimum) pressure due to the pumping of the heart and the resistance to flow in blood vessels. When taking a blood pressure measurement, a mercury-filed manometer is used to measure the pressure in the cuff. When the cuff pressure equals the systolic pressure, the height of the mercury in the open side of the manometer is 130 mm higher than on the side connected to the cuff. What is the patient’s systolic pressure? (The density of mercury is 13.6 x 103 kg/m3)
Explanation / Answer
given
h = 130 mm = 0.13 m
Apply, P = Po + rho*g*h (here po is atmosphric pressure)
= 1.013*10^5 + 13.6*10^3*9.8*0.13
= 1.186*10^5 pa
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