MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Blood circulation. Historical artwork of the human venous system against a background of red blood cells (erythrocytes). This anatomical drawing is from De Humani Corporis Fabrica (On the Structure of the Human Body) by Andreas Vesalius, first published in 1543. Red blood cells are biconcave disc-shaped cells. They contain the pigment haemoglobin, which binds to oxygen and transports it from the lungs to the tissues of the body.
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