En la primera parte de este artículo se presenta una simulación del sistema cardiovascular realizada sobre un computador digital, en lenguaje de simulación contínuo (CSMP). Se estudia de forma especial el sistema de vasos sanguíneos.A simulation in continuous simulation language (C.S.M.P.) of the cardio-vascular system on a digital computer is first put forward. Initially the fluidic equations of a portion of blood vessel are laid out, extending later the mathematical model to the whole distribution network. The heart is studied as an special case of the former theory. A block-diagramm for each type of blood vessel is developed according to their characteristics and possible pathologies. The ensemble of the diagramms makes up the basis for the digital simulation, of which are described the main difficulties encountered. Finally an analysis and evaluation is made of the results obtained.