HISTOLOGY
BLOOD VESSELS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
The blood vessel with the slowest velocity of blood flow.
|
|
artery
|
|
|
arteriole
|
|
|
capillary
|
|
|
vein
|
Explanation:
Detailed explanation-1: -Blood flow is slowest in the capillaries, which allows time for exchange of gases and nutrients. Resistance is a force that opposes the flow of a fluid. In blood vessels, most of the resistance is due to vessel diameter.
Detailed explanation-2: -As the cross-sectional area increases, velocity decreases. Arteries and veins have smaller cross-sectional areas and the highest velocities, whereas capillaries have the most cross-sectional area and the lowest velocities. The vasculature also gives resistance.
Detailed explanation-3: -The average velocity for all capillaries amounted to 0.79 2 0.03 mmlsec.
There is 1 question to complete.