STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood cells. Coloured scanning electron micrograph (SEM) of red blood cells and one white blood cell (upper centre). Red blood cells (erythrocytes) are responsible for carrying oxygen around the body, and for carrying waste carbon dioxide to the lungs for exhalation. White blood cells (leucocytes) are part of the immune system, which protects the body from invading micro-organisms. Magnification: x5000 when printed 10cm wide.
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