20. ”Hyperpolarization-activated current carried by Na+ and K+ in sinoatrial and atrioventricular nodal cells and His-Purkinje cells, involved in generating phase 4 depolarization, increased rate of impulse initiation in pacemaker cell. “是在描述哺乳類心 肌細胞離子流的那一個？
(A)
(B) I_f
(C)
(D)
(E)

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