It is a common misconseption that arteries carry oxygenated blood and veins carry deoxygenated blood. This is true in the systemic pathway, where blood is delivered to the body, but it is not true in the pulmonary pathway. The pulmonary system is when the blood is delievered to the lungs. Here deoxygenated blood is carried by arteries and oxygenated blood is carried by the viens. Ultimately, viens carry blood towards the heart and arteries carry blood away from the body. The arteries have a greater amount of pressure than viens due to the fact that blood is pumped out of the heart. Because of that, there is also significantly less blood volume in the arteries than the viens.
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