STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Blood-filled pulmonary arteriole. Coloured scanning electron micrograph (SEM) of a section through an arteriole (blue) in lung tissue (yellow), showing the red blood cells (erythrocytes, red) inside. An arteriole is a small diameter blood vessel that extends and branches out from an artery and leads to the capillaries. Magnification: x400 when printed at 10 centimetres wide.
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