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Health Sciences 18 Online
OpenStudy (anonymous):

In general, how do veins differ in structure from capillaries and arteries? Veins have more smooth muscle tissue than arteries and capillaries. Veins appear rounder in a cross section than arteries and capillaries. Veins have valves which are absent in arteries and capillaries. Veins have thinner inner walls than arteries and capillaries

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