HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Blood cells. Light micrograph of human blood cells. The cells seen here are mainly red blood cells (erythrocytes, red) and a single leucocyte (a type of white blood cell, purple/red, lower centre). The smaller, purple areas, are platelets (thrombocytes), structures involved in clotting. Red and white blood cells are the two main cell components of blood. Erythrocytes are carriers of oxygen and carbon dioxide. Their biconcave surface provides maximum surface area for the exchange of gases. The lymphocyte is involved in the immune system's defence mechanisms, protecting the body against the invasion of foreign pathogens in the blood and lymph. MGG stain. Magnification: x1150 when printed 10cm wide.
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