Explain the following:
Role of `Na^(+)` in the generation of action potential.

Explanation

To explain the role of sodium ions (Na⁺) in the generation of action potential, we can break down the process into several key steps:

### Step-by-Step Solution:

1. **Resting Membrane Potential**:
- At rest, a nerve fiber has a resting membrane potential of approximately -70 mV. This is maintained by the sodium-potassium pump, which actively transports Na⁺ out of the cell and K⁺ into the cell, creating a concentration gradient.

**Hint**: Remember that the resting potential is negative due to the unequal distribution of ions across the membrane.
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