It could mean that you have Pulmonary Arterial Hypetension.
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Blood Vessels lol am kidding, do u mean the arorta (the pipe that takes blood from the heart to all over the body mainly the brain) or do you mean one of the ones that leaves the left ventricle?
If you mean what percentage of you blood does your heart pump... all of it.
Not sure what you mean by "anterior and posterior", but veins return blood to the heart. I believe you are mistaken. the Superior and Inferior vena cava return blood to the heard.
Kind of. Arteries carry blood away from the heart to the body where the oxygen is used up, and then the deoxygenated blood is transported through capillaries to the veins, through which it is taken to the heart.
Arteries. Or you might mean the aorta, the large artery coming directly out of the heart with others brancing from it.