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【单选题】
胃肠平滑肌基本电节律的产生可能是由于（）。
A.
Ca2+跨膜扩散
B.
K+跨膜扩散
C.
﹣跨膜扩散
D.
Na+跨膜扩散
E.
钠泵活动的周期性变化
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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.
【多选题】平滑肌的光镜结构特点是（）。
A.
肌纤维长梭形，大小不一
B.
无横纹
C.
核位于细胞中央
D.
收缩时核扭曲成螺旋形
E.
核两端的肌浆较丰富
相关题目：
【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.
【多选题】平滑肌的光镜结构特点是（）。
A.
肌纤维长梭形，大小不一
B.
无横纹
C.
核位于细胞中央
D.
收缩时核扭曲成螺旋形
E.
核两端的肌浆较丰富
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