PR S. CINTI / UNIVERSITE D'ANCONE / CNRI / SCIENCE PHOTO LIBRARY PR S. CINTI / UNIVERSITE D'ANCONE / CNRI / SCIENCE PHOTO LIBRARY
Blood capillaries. Coloured scanning electron micrograph (SEM) of blood capillaries. Gases and nutrients are exchanged between the blood and surrounding tissue through the permeable walls of capillaries, the smallest blood vessels.
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