Final answer:
The Na+/K+ pump is an active transport mechanism that uses ATP to move Na+ and K+ ions against their concentration gradients, which is different from passive transport that does not require energy.
Step-by-step explanation:
The Na+/K+ pump is an example of an active transport mechanism that is essential for maintaining the proper function of cells. Rather than passive transport, which facilitates the movement of substances across a cell membrane without the use of energy, the sodium-potassium pump requires energy in the form of ATP (Adenosine Triphosphate) to function. Specifically, the pump moves three sodium (Na+) ions out of the cell and two potassium (K+) ions into the cell, working against their respective concentration gradients.
Active transport such as the Na+/K+ pump is crucial for numerous cellular processes, including establishing a resting potential across the cell membrane and contributing to the action potential necessary for nerve impulses.
To directly answer the question, the maintenance of sodium and potassium ion concentrations by the sodium-potassium pump is an instance of active transport, not passive transport. This is because it requires energy and moves these ions against their concentration gradient, which is the hallmark of active transport mechanisms.