The thickness of the wall and the size of the lumen, What differentiates the structure of veins and arteries?, Lumen, What do we call the space inside veins and arteries, Capillarry, Which blood vessel is responsible for exchanging nutrients, oxygen, and waste products between the blood and the body's tissues. T, Pulmonary, What carries oxygenated blood from the lungs to the heart?, Valves, What prevents blood from flowing backwards and ensures it goes to the right direction?.

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