A very simple scientific question, but at the same time it comes to our mind a lot, because we know that the color of blood is red, so what makes the veins that we see close to the skin appear blue or somewhat bluish? Shouldn't the visible veins be red with the color of the blood they contain?
The veins we see in our skin are never red .. But there is a logical reason for this, as red blood cells, which make up about 40 percent of our blood volume, contain oxygen-carrying molecules called hemoglobin. When red blood cells pass through the lung, hemoglobin picks up and carries oxygen, turning bright red during the procedure. The mixture of hemoglobin with oxygen is called oxyhemoglobin, and it is pumped from the heart with high pressure toward a network of arteries throughout the entire muscle tissue.
When the red blood cells reach the tissues loaded with oxyhemoglobin they pass through very small blood vessels called capillaries, where they give up their load of oxygen to the cells that use that load in the metabolism process. Get enough oxyhemoglobin. Also, the oxyhemoglobin rush suddenly into the capillaries on the surface of the skin causes redness of the cheeks in case of shyness, for example, and so the oxyhemoglobin loses the oxygen in it, and during this process the hemoglobin turns into a color between blue and violet called:
D-oxyhemoglobin collects in larger and larger veins during the journey back to the heart.
Thus, the blue veins that we see, are the ones that carry the oxygen-free blood, which is actually purple in color.
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