The change in time and space of generalized forces when they generate flows for which conservation principles apply is referred to as transport phenomena. After that, we go through mass, impulse, energy, and electric-charge transport, as well as their mathematical equations. From the biophysical study are well-known the next laws: diffusion, viscosity, thermal conductibility, and electric conductibility. Flows are formed in living beings not only by conjugated generalized forces, but also by the simultaneous action of other forces, resulting in frequency of crossing-effects in the human organism. The biophysical modelling uses very frequently the general laws of isomorphisms. Through modelling, we can find the system’s transfer function (the way the system acts upon the entry size) or when it is known, the entry size can be found. The modelling of some bio-medical systems eases the analysis of the processes which take place in that particular original and allow the study of their action in the conditions which are difficult or even impossible to organize. The biophysical modelling offer a language” of quantitative and qualitative processing of experimental data, being compatible and adequate to the laws of biology.