4. (Problem 2.7) A parallel-plate flow chamber is being designed to study the adhesion of leukocytes to endothelium. The channel width is 2 cm. Determine channel heights that can be used to generate wall shear stresses (i.e., Tyx(y = -h/2) = tw) as high as 20 dyn cm² with flow rates less than 2 cm³ s¹. The viscosity of the tissue culture liquid medium is 0.0087g cm³¹ s¹.