In the electric analogue the systemic arterial section ia divided in two compartments: "Inside Thoracic Cavity" and "Outside Thoracic Cavity". The compartments are modelled by the following RLC elements: arterial resistance (R_TT, R_ETT), arterial inertances (L_TT, L_ETT) and arterial compliances (C_TT, C_ETT). R_CBS is the variable peripheral systemic arterial resistance. The venous systemic compartment is modelled with two variable resistances and one compliance.