a. Aorta is the largest artery in the body.
b. It comes right out of the heart and supplies the blood to the whole body. It is very large diameter, approximately the size of circle with your index and thumb.
c. It is big in size because heart pumps all the oxygenated blood to the aorta
d. The largest vein is the inferior cava vein, which collects all blood from the entire body below the arms and leads it back to the heart.
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