题目内容（请给出正确答案）

[主观题]

Which one of the following is not the characteristic of cardiacNa+ Channels？

A、very fast opening

B、responsible for initiating and propagating the action potential in fast response cells

C、threshold potential is –40mV

D、not Tetrodotoxin sensitive

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第3题

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第4题

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第5题

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第6题

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第7题

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