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【单选题】
关于动作电位的说法正确的是A.
动作电位呈衰减性传导
B.
无髓神经纤维传导动作电位的速度较有髓神经纤维快
C.
单个阈下刺激可能产生动作电位
D.
动作电位的传导是用“离子流学说”解释的
E.
膜电位去极化达到阈电位是产生动作电位的必要条件
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