Which side of the heart is associated with a lower pressure?

• A. Left side
• B. Right side
• C. No pressure
• D. Systemic circulation

Answer: (B)

The right side is associated with lower pressure because it handles the pulmonary circuit, moving blood to the lungs. That circuit operates at relatively low pressures to protect the delicate pulmonary vessels, with pressures much lower than those needed to drive blood through the body. In contrast, the left side pumps blood into the systemic circulation, which requires higher pressures to perfuse tissues throughout the entire body. So the side with the lower pressure is the right side, reflecting its role in the low-pressure pulmonary circuit.