First slide

Double Circulation

Question

The blood velocity is the slowest in

Moderate

A

aorta
B

veins
C

arteries
D

capillaries

Solution

The velocity of blood flow is the slowest in capillaries since their total cross-sectional area is greatest. The velocity of blood flow decreases as blood flows from the aorta to arteries to arterioles to capillaries and increases as it leaves capillaries and returns to the heart. The relatively slow rate of flow through capillaries aids the exchange of materials between blood and interstitial fluid.

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