[单选题]
Suppose that the build-up of fatty tissue oa du349z d6ppon the wal: 4*t3oeknu+j l 9+illatk -wml of an artery decreased the rneul j a +l3-tokm9wt*l:ik +4adius by 10%. By how much would the pressure provided by the heart have to be increased to maintain a constant blood flow?
