59.SA node的動作電位的主升段(上升幅度最大的段落)主要是因下列何種離子的流動而產生?
(A)fast sodium channels open,使鈉離子流入細胞內
(B)funny channels open,使鈉離子流入細胞內
(C)funny channels open,使鉀離子流入細胞內
(D)L-type calcium channels open,使鈣離子流入細胞內
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統計: A(131), B(80), C(9), D(280), E(0) #3378040
統計: A(131), B(80), C(9), D(280), E(0) #3378040