Human Anatomy, Physiology, and Medicine. Anything human!
Actually, this is just a myth. The truth is that your blood is an orange-red when it is in your vein, and hasn't come into contact with oxygen. When you get a cut, or the blood in some way leaves your body, it turns a darker shade of red. This is because of the small amount of iron. You see, it's so small, it rusts almost instantly, causing your blood to appear darker.
Blood is RED. Blood is red whether it is arterial or venous. Only the shade of red changes. Anesthesiologists continuously monitor the oxygen saturation of patients in the operating room. While studying anesthesiology, Anesthesia residents are required to learn how the monitors work and the physics behind how the monitors work. All oxygen saturation monitors, both transmittance and reflective utilize red and infrared wavelengths of light to measure oxygen saturation because BLOOD IS RED. Blood is always red whether it is fully saturated with oxygen or in some partial state of oxygen saturation. Blood in the human body is always at least partially saturated with oxygen whether it is arterial or venous. Therefore, Blood is RED. It comes down to physics.
It makes a good sense but pigment present in blood also matter a lot!
Blood is red because it is made up of cells that are red, which are called red blood cells. But, to understand why these cells are red you have to study them on a molecular level. Within the red blood cells, there is a protein called haemoglobin. Each haemoglobin protein is made up subunits called hemes, which are what give blood its red colour.
Blood is always red, even when it is in the body. The reason it looks blue or purple is because the skin makes the veins appear this way. All blood has some level of oxygen in it that naturally gets taken in through breathing and through the skin.
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