The velocity of blood flow is minimum in

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(A) The velocity of blood flow is inversely proportional to the total cross-sectional area of the blood vessels.While the $Aorta$ has the largest diam

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Capillaries

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(A) The velocity of blood flow is inversely proportional to the total cross-sectional area of the blood vessels.While the $Aorta$ has the largest diameter, the total cross-sectional area of the $Capillaries$ is the highest among all blood vessels due to their vast number.Because of this massive total cross-sectional area, the velocity of blood flow is at its minimum in the $Capillaries$, which facilitates the efficient exchange of gases, nutrients, and waste products between the blood and tissues.

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