Transport of `Na^(+)//K^(+)` across the membrane is

Options

A. Active
B. Passive
C. Energy independent
D. Along the concentration gradient

Answer

To determine the type of transport involved in the movement of sodium (Na⁺) and potassium (K⁺) across the cell membrane, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Ions and Their Movement**:
- The question refers to the transport of sodium (Na⁺) and potassium (K⁺) ions.

2. **Understand Concentration Gradients**:
- Concentration gradient refers to the difference in concentration of ions across the membrane.
- Movement "against the concentration gradient" means moving from an area of lower concentration to an area of higher concentration.

3. **Determine the Direction of Transport**:
- In the case of the sodium-potassium pump, sodium ions are transported out of the cell (against their concentration gradient) and potassium ions are transported into the cell (also against their concentration gradient).

4. **Energy Requirement**:
- Moving ions against their concentration gradients requires energy. This energy is typically provided by ATP (adenosine triphosphate).
- Since energy is required for this process, it is classified as active transport.

5. **Conclusion**:
- The transport of Na⁺ and K⁺ across the membrane is an example of **active transport**.

### Final Answer:
The transport of Na⁺ and K⁺ across the membrane is **active transport**.

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