Blood cells, SEM

Blood cells, SEM

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Credit: SUSUMU NISHINAGA/SCIENCE PHOTO LIBRARY

Caption: Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes) and a white blood cell (leucocyte, pink, upper centre). Red blood cells are biconcave, disc-shaped cells that transport oxygen from the lungs to body cells. They circulate around the body in the blood and also remove carbon dioxide to the lungs for exhalation. Their red colour comes from the oxygen-carrying protein haemoglobin. Red blood cells are the most abundant cell in the blood. They have no nucleus and are about 7 micrometres in diameter. White blood cells perform functions ranging from cleaning up cellular debris, to defending the body against bacteria and other pathogens.

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Keywords: anatomical, anatomy, biconcave, biological, biology, blood, cell, cells, circulation, circulatory system, coloured, disc-shaped, erythrocyte, erythrocytes, false-colour, false-coloured, haematological, haematology, haemoglobin, healthy, hematology, hemoglobin, human body, leucocyte, leukocyte, many, multiple, normal, oxygen-carrying, rbc, rbcs, red, red blood cell, red blood cells, scanning electron micrograph, scanning electron microscope, sem, white blood cell

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