Question

multiple choice question
systolic pressure would be the lowest in which of these vessels?

• superior vena cava
• aorta
• hepatic portal vein
• renal artery
• pulmonary artery

Explanation:

To determine where systolic pressure is lowest, we analyze blood vessel types and pressure dynamics:

• Arteries (Aorta, Renal artery, Pulmonary artery) carry oxygenated (or in pulmonary’s case, deoxygenated) blood away from the heart, with relatively high pressure (systolic pressure is highest in the aorta, then decreases in smaller arteries).
• Veins (Superior vena cava, Hepatic portal vein) carry blood toward the heart. Venous pressure is much lower than arterial pressure because veins have thinner walls, less muscle, and rely on valves/skeletal muscle to move blood. Among veins, the Superior vena cava returns deoxygenated blood from the upper body to the right atrium, where pressure is near zero (lowest in the circulatory system). The Hepatic portal vein is a portal vein (connects capillaries of digestive organs to liver capillaries) but still has higher pressure than vena cava.

Thus, the Superior vena cava has the lowest systolic pressure.

Answer:

A. Superior vena cava