Blood cells

Blood cells

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Credit: KENNETH EWARD/BIOGRAFX/SCIENCE PHOTO LIBRARY

Caption: Blood cells. Coloured Scanning Electron Micrograph (SEM) of human blood cells. Three components of blood are seen: erythrocytes (red), lymphocytes (white), and platelets (blue). Erythrocytes or red blood cells are carriers of oxygen and carbon dioxide. Their biconcave shape provides maximum surface area for the exchange of gases. Lymphocytes or white blood cells play a central role in immune defence mechanisms, fighting pathogens in the blood and lymph system. While platelets are not true cells, but membrane bound cell fragments of the bone marrow which help the sizes. Magnification: x2000 at 5x7cm size.

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Keywords: anatomy, blood cell, cells, circulation, circulatory system, clotting agent, erythrocyte, haematology, healthy, hematology, human body, immune system, immunology, lymphocyte, mixed, normal, platelet, red blood cell, scanning electron micrograph, sem, white blood cell

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