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  • 1-27-2017 Every capillary has a muscle, so size is changeable.
  • Human red blood cells are ca. 6–8 μm in diameter. Human capillary vessels can measure down to 5μm in diameter. Red blood cells are able to go through capillaries by squeezing themselves. Even the larger white blood cells (over 15 μm in diameter) can squeeze themselves through capillaries with very small diameter. - ' the red cells adapt their shape to different flow conditions of the blood and are able to pass through very small capillaries with diameters smaller than their own diameter ' Source: - Further information: -

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