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Characteristics of blood vessels.jpg Diagram and photomicrograph of a large vein.jpg Diagram and photomicrograph of a medium vein.jpg Diagram and photomicrograph of a muscular artery.jpg Diagram and photomicrograph of an elastic artery.jpg Molecular mechanisms for vasodilation.jpg Molecular mechanisms of vasoconstriction.jpg Photomicrograph of elastic vs muscular arteries.jpg