Heart excitation A simple model for the time xt it takes for an electrical impulse in the heart to travel through the atria ventricular node of the heart is
xt+1 = {375 / (xt - 90)} + 100; xt > 90
Find the relevant equilibrium and use the stability criterion to determine when it is stable.
Draw a cob webbing diagram
[Source: Adapted from D. Kaplan et al., Understanding Nonlinear Dynamics (New York: Springer-Verlag, 1995)]