The software would for example model the effects of changes in blood pressure, heart rate and rhythm, skin colour change, in response to various interventions such a drug administration, change in posture, blood loss etc...
If you're visualizing 3D results you might contact Peter Hunter's research group at U. Auckland about this. They are heavily involved in simulating virtual patients.
I can imagine how another field could use this: testing not just effects of medical drugs but also metabolic nutrition interventions and reactions to foods (these are spreading fast in the population). I hope you find an adequate software eventually and let us know.
I'm not quite sure what you are trying to do, but take a look into HumMod.org. And if it's not what you are looking for, at least it's fun to play with and free.
Late answer, but try HOM Physiology. It unlike most others, it features cardiovascular, respiratory, gastrointestinal, endocrine and some neurological simulations all coupled together in a simple graphical environment.
We (Empresarios Agrupados Internacional, Madrid, Spain) are finishing the first commercial version of PhysPK (www.physpk.com) which is a M&S (including optimization and other integrated toolboxes) software system for physiology modelling, based on non-algorithmic language modelling and object-oriented paradigm. It emphasizes reusability and multilevel modeling, and it is not limited to PBPK standard, but implement full pressure dynamics and allows linking empirical with mechanistic models in a seamless way and GUI framework. It was designed as an alternative to other approaches to virtual physiological human, which true ability to provide a bridge between pharma-biotechnology arena and the healthcare domain. We will publish in a short time several articles showing its features and validating their results. In case that you are interested to a better knowledge of their features you can contact with me in [email protected] or [email protected], and I will communicate to you the delivery of the first commercial version and send more information.