Aetna....i am pretty sure thats what my professor told me but he is not th brightest so.....................
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to keep flowing of blood from left atrium to left ventricle
Answer:
Arteries carry oxygenated blood from the heart, while veins carry oxygen-depleted blood back to the heart. ... The pulmonary veins transport oxygenated blood back to the heart from the lungs, while the pulmonary arteries move deoxygenated blood from the heart to the lungs.)
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hahahahaha soooo cuttteeeeee i love ur doggg