Sodium channels are voltage dependent. This means that ______________________.
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   their activity is responsive to changes in voltage across the neuronal membrane; | 
   
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   they generate a shift in voltage associated with hyperpolarization; | 
   
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   the channels open wider with increasing depolarization; | 
   
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   both a and b are correct alternatives; | 
   
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   both a and c are correct alternatives; | 
   
   
   
   
   
   [Review Part 1 of the tutorial]
   [Review Part 2 (Matching) of the tutorial]