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Stay far enough away that the large vessel's helmsman can see you.
Stay out of its way! By "large vessel" you mean something like a cargo ship? If you are in a small craft and the other guy is in a ship, assume, unless he gives a signal to acknowledge he sees you (like blowing his horn, flashing lights, etc) that he doesn't see you. If he can't see you and you get in his way, he'll probably squash you flat.
Blood flow in the center of a large vessel is faster because the walls of the blood vessel may have a buildup of cholesterol on them.
no
Carotid artery
It is a large artery.
The large blood vessel is called the aorta.
large vessels on top of the heart are the veins.
Big ship. Vessel. Carrier.
Go to a large modern auto salvage yard and ask the operator; he should be able to give you a comprehensive answer.
the heart
aorta