Which of the following structures has the greatest effect on systemic vascular resistance?
A)Veins
B)Arterioles
C)Heart
D)Capillaries

Question

Quizplus · Accepted Answer

Arterioles are the primary regulators of systemic vascular resistance through their ability to constrict or dilate, which affects blood flow and pressure in downstream vessels. Veins have less of an impact due to their thin walls and large capacitance, while capillaries are primarily involved in gas exchange and nutrient delivery rather than resistance regulation. The heart plays a role in overall cardiac output, but does not directly impact systemic vascular resistance.

Which of the Following Structures Has the Greatest Effect on Systemic