Fig 2. Scheme of the in vitro model.

Block diagram of the model for the in vitro experiments. B ₁…B _N and D ₁…D _N are respectively thresholds and potentiations of the different controllers, while J ₁…J _N indicate the amount of releasable insulin for each controller. P represents the portal vein, I is the plasma insulin compartment, M the measurement compartment. The quantity G(t) is the external glucose concentration.