## Core Concept
The Na/K pump, also known as the sodium-potassium pump, is an enzyme that plays a crucial role in maintaining the resting potential of neurons and other cells by transporting sodium and potassium ions across the cell membrane. This process requires energy, which is provided by the hydrolysis of ATP. The enzyme responsible for this process is an example of an **ATPase**.

## Why the Correct Answer is Right
The correct answer, , refers to **Na+/K+-ATPase**, which is the enzyme directly involved in the sodium-potassium pump. This enzyme uses the energy from ATP hydrolysis to transport three sodium ions out of the cell and two potassium ions into the cell against their concentration gradients. This process is essential for maintaining the cell's resting membrane potential and regulating the balance of fluids and electrolytes within the cell.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because it does not accurately represent the enzyme used by the Na/K pump.
* **Option B:** - This option is incorrect because it also does not accurately represent the enzyme used by the Na/K pump.
* **Option D:** - This option is incorrect because it does not correctly identify the Na+/K+-ATPase enzyme.

## Clinical Pearl / High-Yield Fact
A key point to remember is that the Na+/K+-ATPase pump is **inhibited by digitalis (digoxin)**, which is used in the treatment of heart failure and certain arrhythmias. By inhibiting the Na+/K+-ATPase pump, digitalis increases the intracellular concentration of sodium, which in turn increases the activity of the **Na+/Ca2+ exchanger**, leading to increased intracellular calcium levels. This results in increased contractility of the heart muscle.

## Correct Answer Line
**Correct Answer: C. Na+/K+-ATPase**.