A simple model for the time it takes for an electrical impulse in the heart to travel through the atrioventricular node of the heart is 375 Xt +1 = + 100 xt > 90 Xt - 90 where xt is measured in milliseconds.t (a) Find the equilibria and determine stability. (Enter your answers as comma-separated lists. If an answer does not exist, enter DNE.) stable X = unstable X =

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