In the resting state of the neural membrane diffusion due to concentration gradients, allowed, would drive

Options

A. `Na^(+)` into the cell
B. `Na^(+)` out of the cell
C. `K^(+)` into the cell
D. `K^(+)` and `Na^(+)` out of the cell

Answer

### Step-by-Step Solution

1. **Understanding the Resting State of Neurons**:
- In the resting state, neurons maintain a specific ion concentration gradient across their membranes. This is crucial for the generation of action potentials.

2. **Ion Concentration Gradients**:
- Inside the neuron (cytoplasm), there is a high concentration of potassium ions (K⁺) and a low concentration of sodium ions (Na⁺).
- Outside the neuron, there is a high concentration of sodium ions (Na⁺) and a low concentration of potassium ions (K⁺).

3. **Diffusion Due to Concentration Gradients**:
- Because of these gradients, sodium ions (Na⁺) will naturally diffuse into the neuron from the outside, where they are in higher concentration, while potassium ions (K⁺) will tend to diffuse out of the neuron.

4. **Conclusion**:
- Therefore, in the resting state of the neural membrane, diffusion due to concentration gradients would drive sodium ions to enter the cell.

5. **Final Answer**:
- The correct response to the question is that sodium ions enter into the cell.