Want this question answered?
They are not really red and blue. This is seen in preserved animals (and cadavers) and in drawings to show which are higher in oxygen (red) and lower (blue). In general, you also can see than veins are shown in blue and arteries are red.
The capillaries are in between the red and blue veins :)
because pokemon red has more fire pokemon than blue and green but blue has more water ones than all the others and green has more grass pokemon
Red veins carry oxygenated blood.
The differences between red and blue light are Red stands for n00b and blue stands for b00b! your mum
Your veins
It's not. Blood is only darker red when it is in veins.
the color
red has a lower frequency and a longer wavelength than blue
A blood seems blue in veins because when a blood is in veins they are low in oxygen and therefore look blue. When they get oxygenated, they become red and are carried by the artery.
blue and white stars are hotter than red stars (and newer).
The deoxygenated blod in the veins is a darker color than the bright red blood of arteries but it is more of a dark red or brown than blue colored. Veins look blue because that is the color of the vessel walls and skin.