Figure 6.

Solution diagram for the modified HH cleft model as a function of cleft width w_f with fixed fractional potassium cleft current F_IK = 0.75. (A) Spontaneous autorhythmic solutions (blue curves) cease for w_f> 7.5 (black curve), and the soloution is at a stable steady state. (B) The amplitude of cleft potassium concentration [K]_cl oscillations and the average value of potassium cleft concentration is a decreasing function of w_f. (C) Peak cleft potassium current I_K,cl increases when w_f increases. (D) The frequency response to w_f is biphasic and when F_IK = 0.75.