Velocity of blood flow is slowest in the veins because the blood must move uphill against gravity in these vessels.

Name: Velocity of blood flow is slowest in the veins because the blood must move uphill against gravity in these vessels.
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The velocity of blood flow is slowest in the capillaries, not because of gravity, but due to the large total cross-sectional area of the capillaries which slows down the flow to allow for exchange of nutrients, gases, and waste products between blood and tissues.

Velocity of Blood Flow Is Slowest in the Veins Because