FRANCIS LEROY & DORIO ERICO, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY & DORIO ERICO, BIOCOSMOS / SCIENCE PHOTO LIBRARY
Blood cells escaping from a small artery, animation. A white blood cell is shown engulfing old red blood cells (spiky). White blood cells form part of the body's immune system, defending the body against bacteria and other pathogens. Red blood cells are the most abundant cells in the blood and travel throughout the body carrying oxygen and removing waste. The irregularly shaped colourless bodies are platelets, which help to form blood clots at sites of injury.
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