The approach by us adopted in this paper constitutes an advancement with respect to traditional measurements of dielectric (or mechanical) properties. Indeed, standard dielectric (or mechanical) measurements of physical systems are only able to obtain complex dielectric constant (or complex Young module). Those modules give only global information about reversibility and irreversibility and don't specify the amount of the particular phenomenon which give rise to it. By means of our new point of view it is possible to obtain a more detailed investigation by determining the amount of a single phenomenon which is hidden in a sample through feasible experimental measurements, since the relationships between the aforementioned coefficients and complex dielectric (or mechanical) constant were obtained (see Eq. (17)–(20)). In our case, by perturbing a medium (biological tissue, blood) with an electric field we obtained detailed information such as the amount of “elastic” and “inelastic” polarization characteristics of the phenomenon which occurs inside the medium as a function of the frequencies of the electric field. These phenomena can be attributed to molecular events related to the WBCs dynamism characterized, as it is known, by continuous and constant fluctuations of the molecular components of plasma membrane. Moreover these relations allow to determine the entropy production (see Eq. (37)) which gives precious information on the degree of irreversibility of the phenomenon occurring inside the medium and how it evolves. Finally it is important to point out the knowledge of these coefficients can be used as a new characterization of some aspects of the blood.