<prompt> Poiseuiftes law isF PA - PB pr48e4F PA x PB pr48e1F PA PB pr48e1F PA PB pr48e1  <response>: By integrating the velocities of all the concentric rings of flowing blood and multiplying them by the areas of the rings, one can derive the following formula, known as Poiseuilles law: in which F is the rate of blood flow, DPPA-PB is the pressure difference between the ends of the vessel, r is the radius of the vessel, l is length of the vessel, and e is viscosity of the blood. F PA - PB pr48e4 Ref: Guyton and Hall Textbook of Medical Physiology 12th Edn page No:309 