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The Fahraeus–Lindqvist effect is an effect where the viscosity of a fluid, in this case blood, changes with the diameter of the tube it travels through; in particular there's a decrease of viscosity decreasing the tube's diameter (only if the vessel diameter is between 10 and 300 micrometers). This because erythrocytes move over the center of the vessel, leaving plasma at the wall of the vessel.
[edit] Further reading
- Schmidt, Lang (Hrsg.): Physiologie des Menschen: Mit Pathophysiologie (S. 623). Springer, Berlin; 30. Auflage 2007. ISBN 978-3540329084
- This article incorporates information from the German Wikipedia.