Red blood cells, SEM

Red blood cells, SEM

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Credit: DR GARY GAUGLER/SCIENCE PHOTO LIBRARY

Caption: Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells (erythrocytes). These biconcave, disc-shaped cells carry oxygen in the blood. They also carry carbon dioxide produced by respiration to the lungs to be exhaled. Their red colour is due to haemoglobin, a protein that binds to oxygen and carbon dioxide. In humans they measure about 8 micrometres in diameter.

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Keywords: anatomy, biconcave, cardiovascular, cells, circulatory, clump, coloured, erythrocyte, erythrocytes, group, haematology, healthy, hematology, human body, multiple, normal, oxygen transport, red blood cell, scanning electron micrograph, sem, three, vascular system

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