Because of their small diameter,capillaries account for almost all the resistance to blood flow in the circulatory system.

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Capillaries have a very small diameter, but because they are so numerous and arranged in parallel networks, the overall resistance they offer to blood flow is relatively low. The majority of resistance in the circulatory system is actually due to the arterioles, which regulate blood flow through their ability to constrict and dilate.

Because of Their Small Diameter,capillaries Account for Almost All the Resistance