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Red blood cells. Coloured Transmission Electron Micrograph (TEM) of sectioned human red blood cells (erythrocytes) in a rouleau formation. These cells often stick together in this stacked formation due to their biconcave shape. This shape increases surface area for the exchange of gases. The red inside of the cell contains no nucleus or organelles. Instead, each cell is packed with haemoglobin, a red iron- containing pigment which has an efficient oxygen carrying capacity. The principal function of erythrocytes is the distribution and transport of oxygen and carbon dioxide around the body. Magnification: x7200 at 6x7cm size.
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