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Red blood cells

Red blood cells

P242/0284

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Credit

JOHN BAVOSI / SCIENCE PHOTO LIBRARY JOHN BAVOSI / SCIENCE PHOTO LIBRARY

Caption

Red blood cells. Artwork of red blood cells (erythrocytes) and platelets (thrombocytes, blue). Red blood cells contain the oxygen-carrying pigment haemoglobin (seen in the red blood cell at centre). On average there are 350 million haemoglobin molecules in each red blood cell. Haemoglobin has four globin polypeptide chains (pink/red), each with an iron-containing haem group (green). The haem groups bind reversibly to oxygen in the lungs, where it is high in concentration, and release it in tissues, where the concentration is low. They also carry carbon dioxide to the lungs for exhalation. Platelets are cells that are involved in blood clotting.

Release details

Model release not required. Property release not required.

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