**Figure 4.** **Electrical model of the peripheral
vasculature.** A current generator forces current through two
resistances representing, respectively, the arterial and venous
components of the total peripheral resistance. Capacitances
represent the hydraulic capacitance of the vasculature, divided
into three components: arterial, peripheral venous (venular), and
central venous. Total charge in the system represents the total
volume contained within the vasculature. Charge contained in each
capacitor equals the product of voltage and capacitance.
Electrical ground corresponds to the zero reference for pressure.
Volume within each of the subdivisions of the total volume is
represented by the product of the individual capacitance and its
voltage (pressure).