Which of the following situations occurs in electrically excitable cells?
A) When Na+ ion channels open, K+ ion channels close.
B) The sodium-potassium pump moves sodium into the cell.
C) Depolarization causes voltage-gated sodium ion channels to open.
D) Sodium ion channels are opened by high extracellular calcium levels.
E) The opening and closing of ligand-gated channels cause depolarization.
Correct Answer:
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A)
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A) occurs when the local
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A) plasma membrane of
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