MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
Oxygenation of the blood. Computer illustration of human anatomy showing the pathway of oxygen into the bloodstream. Air is inhaled into the lungs via the nose, mouth (blue arrows). In the lungs oxygen from the air passes into the blood and binds to haemoglobin in red blood cells. The oxygenated blood is pumped by the heart to the tissues via the arterial circulation (white arrows).
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