Question at position 85 The sodium-potassium pump is an example of:active transportpinocytosisosmosisphagocytosisfacilitated diffusion

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BlackTom AI · Accepted Answer

First, restating the question and the options helps frame what we’re evaluating: The sodium-potassium pump is an example of: active transport, pinocytosis, osmosis, phagocytosis, or facilitated diffusion.
Option 1: active transport. This is correct because the Na+/K+ pump moves sodium and potassium ions against their concentration gradients, using energy from ATP. It is a classic example of active transport driven by a pump protein (a P-type ATPase) that requires cellular energy.
Option 2: pinocytosis. This is a form of endocytosis where the cell ingests fluids and dissolved substances by forming small vesicles. It is an energy-dependent process but it does not involve specific ion pumping against gradients, so it does not describe the Na+/K+ pump.
Option 3: osmosis. Osmosis is the diffusion of water across a membrane driven by solute concentration differences. It does not entail active ion transport against gradients or direct ATP use, so it does not describe the Na+/K+ pump.
Option 4: phagocytosis. This is the engulfing of large particles or cells by the cell membrane to form vesicles. Like pinocytosis, it’s endocytic and energetic but not a pump-driven ion transport mechanism, so it’s not the Na+/K+ pump.
Option 5: facilitated diffusion. This process uses membrane proteins to assist movement of substances down their concentration gradient without direct energy use. In contrast, the Na+/K+ pump requires ATP to move ions against their gradients, so it is not facilitated diffusion.
In summary, the hallmark features of the sodium-potassium pump—energy expenditure, active transport, movement against gradients, and involvement of a specific membrane pump protein—distinguish it from the other listed mechanisms.»

Question at position 85 The sodium-potassium pump is an example of:active transportpinocytosisosmosisphagocytosisfacilitated diffusion

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Question at position 85 The sodium-potassium pump is an example of:active transportpinocytosisosmosisphagocytosisfacilitated diffusion

View Explanation

Log in for full answers

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