When blood flows along a blood vessel, the flux F (the volume of blood per unit time that flows past a given point) is proportional to the fourth power of the radius R of the blood vessel:
F = kR4
(This is known as Poiseuille's Law.) A partially clogged artery can be expanded by an operation called angioplasty, in which a balloon-tipped catheter is in
ated inside the artery in order to wide it and restore the normal blood flow.
Show that the relative change in F is about four times the relative change in R. How will a 1% increase in the radius a�ffect the flow of blood?

A 1% increase in the radius corresponds to a/an ______% ______ in blood flow.

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1. I got the answer. It is 4 % increases in blood flow.

thanks anyway.

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posted by Isik

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