The heart's back-up system saves lives. And a search for ways to make new cardiac vessels sprout.
D003097:Collateral Circulation / Q000502:physiology*; D003326:Coronary Circulation / Q000502:physiology*; D003327:Coronary Disease / Q000503:physiopathology* / Q000628:therapy; D015444:Exercise / Q000502:physiology; D005544:Forecasting; D006801:Humans