All of them?
it bleeds out of the red one, the red vain pumps blood around the body and the blue vains pump the blood back to the heart
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Yes, it can, when you pop a blood vessel. You can do this by pushing too hard on a vein or artery. Also, when you get a cut it is coming out of a vein or artery.
Blood vessels that are larger can be felt, like arteries and veins, though it is easier to feel arteries because they have a pulse.