I am certain that after the dust of centuries has passed over our cities, we, too, will be remembered not for victories or defeats in battle or politics, but for our contribution to the human spirit. My husband and I spend the evening scanning the home shopping channel for good late night sales while eating a bag of microwave popcorn, then dozing off on the sofa. When we moved to a new state after my husband was transferred, my daughter was four and discovered a cherry tree in the back yard. Actually blood is bright red in its oxygenated form and a dark red when in it's deoxygenated form. In simpler terms, it's bright red when it leaves the lungs all full of oxygen and dark red when it returns to the lungs for a refill.
Veins appear blue because light penetrating the skin, is absorbed and reflected back to the eye.
Only the higher energy wavelengths can do this, so only the higher energy wavelengths are seen. And as you guessed, those higher energy wavelengths are blue.