[单选题]
Suppose that the buio:sykw/1;v. hk k v9ixld-up of fatty tissue on the wall of an arteryi2+fs: h fv:opyneo.h;*ef8z decreased the radius by 8:vihnyzfofe* hf;.2p+ o: es10%. By how much would the pressure provided by the heart have to be increased to maintain a constant blood flow?
