(a) What is the pressure difference required to make blood flow through an artery of inner radius 2.0 mm and length 0.20 m at an average speed of 6.0 cm/s? 

(b) What is the pressure difference required to make blood flow at an average speed of 0.60 mm/s through a capillary of radius 3.0 μm and length 1.0 mm? 

(c) Compare both answers to your average blood pressure, about 100 mmHg.