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The Fåhraeus–Lindqvist effect /fɑːˈreɪ.əs ˈlɪndkvɪst/ describes how the viscosity of a fluid, in this case blood, changes with the diameter of the tube it travels through. In particular there is a 'decrease in viscosity as the tube's diameter decreases'. This is because erythrocytes move over to the centre of the vessel, leaving only plasma near the wall of the vessel.
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