In animals,nerve signals are generated due to the movement of which of the following?
- ADue to the electrical potential difference generated by the movement of $K^+$ ions.
- BDue to the electrical potential difference generated by the movement of $Na^+$ in the $(Na^+ - K^+)$ pump.
- CDue to the electrical potential difference generated by the movement of $Ca^{2+}$ ions.
- DNo nerve signals are generated in animals.
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