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## Homework Statement

Blood is a viscous fluid. If due to plaque, the cross-sectional area of an artery is reduced by a factor 4 over a segment with a length of 1.5 cm, approximately by what factor would the pressure difference between both ends of this segment need to be increased in order to maintain the same flow?

## Homework Equations

P=pgh

## The Attempt at a Solution

Doesn't only height matter and not the cross-sectional area? Any help is greatly appreciated!!!