False colour SEM showing red & white blood cells.

Credit: MANFRED KAGE/SCIENCE PHOTO LIBRARY

Caption: False colour scanning electron micrograph showing red cells (erythrocytes) and a white cell (lymphocyte) from human blood. The function of the erythrocytes is the distribution & transportation of oxygen & carbon dioxide to & from the cells of the body. Surrounded by a thin elastic membrane, the whole of the interior is filled with the red pigment haemoglobin, which has a good oxygen carrying capacity. Erythrocytes have a biconcave disc shape & are flexible so that they can accommodate themselves to the smallest of capillaries. The function of the lymphocytes is that of defense against disease. Magnification x800 at 6x7cm size.

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Keywords: anatomy, blood, blood smear, cells, erythrocyte, human body, lymphocyte, red blood cell, smear, white blood cell

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