Red blood cells, SEM

Red blood cells, SEM

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Credit: SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Caption: Red blood cells, coloured scanning electron micrograph (SEM). Red blood cells (erythrocytes) are biconcave, giving them a large surface area for gas exchange, and highly elastic, enabling them to pass through narrow capillary vessels. They have no nucleus, but their interior is packed with haemoglobin. Haemoglobin is a red iron-containing pigment that enables these cells to carry oxygen to body tissues and to transport waste carbon dioxide back to the lungs. Magnification: x3900 when printed 10 centimetres tall.

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Keywords: biconcave, biological, biology, cell, cells, coloured, erythrocyte, erythrocytes, false-coloured, haematology, haemoglobin, hematology, hemoglobin, human, many, multiple, people, person, rbc, rbcs, red, red blood cell, scanning electron micrograph, scanning electron microscope, sem

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