Smoking tobacco is bad for your circulatory health. in an attempt to maintain the blood's capacity to deliver oxygen, the body increases its red blood cell production, and this increases the viscosity of the blood. in addition, nicotine from tobacco causes arteries to constrict

for a nonsmoker, normal blood flow requires a pressure difference of 8.0 mmhg between the two ends of an artery. assume that smoking increases viscosity by 10% and reduces the arterial diameter to 90% of its previous value. for a smoker, what pressure difference is needed to maintain the same blood flow?
express your answer in millimeters of mercury.