If blood is red, how come our veins appear blue?

Rooster Cogburn , Rooster Cogburn, answered

Best explanation from ScienceLine.

Blood in your veins has very little oxygen and is a dark red color that looks almost blue when covered by your skin. Your arteries have bright red blood because it has a lot of oxygen in it that is being carried throughout your body to be used by tissues.

crow robot answered

I googled it. Something about the light waves and the skin

Lily Watson answered

I've read that when it hits the oxygen (when you get cut and bleed) that it turns red. And something about chemical reaction, something like that.

3 Answers