Question Detail
Question
Blood flow rate is at its LOWEST in which type of blood vessel?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Blood flow rate is at its lowest in capillaries. Although capillaries have the smallest individual diameter, their vast total cross-sectional area slows blood flow, allowing adequate time for exchange of gases, nutrients, and wastes.
Hint
The extensive network and large total cross-sectional area of these vessels slows flow.