A human vein is considered as a capillary tube of radius 2 μm. Assuming a stream lined flow the speed of flow of blood at center of vein is 0.66 ms-1. What is pressure difference across ends of a vein 1 mm in length? The pressure at higher end of vein = 104 Pa. Viscosity of blood = 4 x 10-3 Nsm-2 .
