(Small diameter)× (very large number)= the reason that _______ are the blood vessels with more total cross-sectional area than the other blood vessels listed.
A) arteries
B) arterioles
C) capillaries
D) venules
E) veins

Question

Quizplus · Accepted Answer

According to Poiseuille's law, blood flow is directly proportional to the fourth power of vessel radius. This means that a small change in radius has a larger effect on blood flow. Capillaries have the smallest diameter among the listed blood vessels, resulting in a large total cross-sectional area and slower blood flow, allowing for exchange of nutrients and gases between blood and tissues. Therefore, capillaries have more total cross-sectional area than the other blood vessels listed.

(Small Diameter)× (Very Large Number)= the Reason That _______ Are