alleryStart learning →Which pressure in the cardiac cycle is the one at which blood flow first begins past the cuff?
AThe systolic pressure, the peak value
BThe diastolic pressure, the low value
CThe hydrostatic pressure of the blood
DThe atmospheric pressure on the arm
Answer & Solution
Correct answer: A. The systolic pressure, the peak value
1. The cuff is inflated until blood flow stops, then the pressure is slowly released.
2. The moment blood first pushes past the cuff, the arterial pressure has just matched the cuff pressure.
3. That value is the systolic pressure, the peak pressure in the cardiac cycle.
4. The diastolic pressure is read later, when the sound disappears, and is the lowest pressure in the resting phase.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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