3. Human Blood Can Be Blue
The blood that flows through our vines under the skin seems to be blue, but that is a result of optical illusion. When the light hits our skin, blue light reflects back and gives the illusion that our blood is blue.
But eventually, human blood is red because of the presence of hemoglobin. Hemoglobin is cells that help carry and transport oxygen from the lungs to the rest of the body and contain iron. That special natural iron turns red when it intact with oxygen and that is what makes our blood red.
