Medical News Today: Is blood actually blue?

Some people believe that blood is blue when it is in the body and only turns red when it interacts with oxygen in the air. In this article, we investigate this and other myths and facts about the blood. Which animals have blue blood? How much blood is in the human body? Why is blood red? Find out all this and more.

from Featured Health News from Medical News Today https://ift.tt/2Hr3N4Y