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【单选题】
胃肠平滑肌基本电节律的产生主要由于：
A.
Ca2+的跨膜扩散
B.
K+的跨膜扩散
C.
Cl-的跨膜扩散
D.
生电性钠泵的周期性变化
E.
Na+的跨膜扩散
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参考答案：
参考解析：
刷刷题刷刷变学霸
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【单选题】Biological ClockWhen the sun rises on a warm and sunny day, you can see some flowers open up. When they close late in the afternoon, other flowers open.Biological rhythms（生物节律）, like the opening and c...
A.
But where can you find it?
B.
This makes them feel tired.
C.
In the summer they fly back to have babies.
D.
We are learning more and more about them.
E.
Biological clocks can be adjusted.
F.
Other rhythms are based on months, seasons or years.