Vascular Branching. A small blood vessel of radius r branches off at an angle 8 from a larger vessel of radius R to supply blood along a path from A to B. According to Poiseuille's Law, the total resistance to blood flow is proportional to a sin 0-b cos 0 T = sin OR4 sin Or4 Where a and b are as in figure below. Show that the total resistance is minimized when cos 0 = (r/R)“ COS
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