Which of the Following Blood Vessels Would Have the Greatest

Question

Which of the following blood vessels would have the greatest resistance to blood flow?
A)a long, large diameter blood vessel
B)a short, large diameter blood vessel
C)a long, small diameter blood vessel
D)a short, small diameter blood vessel
E)a medium length, large diameter blood vessel

Accepted Answer

Resistance to blood flow is directly proportional to vessel length and inversely proportional to vessel radius to the fourth power. Therefore, a long, small diameter blood vessel would have the greatest resistance to blood flow.