AdvertisementPossible Heart Benefits Of Taking Estrogen Get Another LookMarch 30, 2016Rae Ellen BichellfacebookEmailFatty plaque (shown here in yellow) blocks about 60 percent of this coronary artery's width. The increasing thickness of artery walls is just one factor that can increase vulnerability to a heart attack or stroke. (G. Macchiarelli, S.A. Nottola/Science Source)