The viscosity of blood is η = 4 × 10-3 (P a · s). The pressure difference between inlet and outlet, generated by the heart is about ?P = 100(torr). The radius of the aorta is rA = 1.2(cm). The length of the aorta is l = 20(cm). If ten percent of the total pressure drop produced by the heart occurs across the aorta what is the flow rate through the aorta? If the radius of the aorta decreased by 5 percent how much would the blood flow through the aorta decrease?