Red blood cells. Coloured scanning electron micrograph (SEM) of red blood cells in a human blood vessel. The red blood cells (erythrocytes, at top) are filling the lumen of the blood vessel. Layers of the wall of the blood vessel are seen (blue). Red blood cells are the most abundant type of cell in the blood. Their principal function is to distribute and transport oxygen around the body. As a red blood cell matures its nucleus and other internal organelles are lost; it becomes disc-shaped and filled with haemoglobin, a red iron-containing pigment with an efficient capacity to carry oxygen around the body. Magnification: unknown.
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