<prompt> Plasma is a Newtonian fluid because:Viscosity is directly propoional to shear stressViscosity is equal to shear stressViscosity is inversely related to shear stressViscosity is independent of shear stress  <response>: For a Newtonian fluid, viscosity remains constant, independent of the shearing force. Whole blood is a non-Newtonian fluid; its viscosity goes changing with the changes in shearing force. 