Sodium-potassium pump

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actively transports ${3 Na}^{+}$ outwards for $2 K^{+}$ into the cell

actively exports ${3 Na}^{+}$ but passively imports $2 K^{+}$

actively transports $2 K^{+}$ outwards for ${3 Na}^{+}$ into the cell

actively imports $2 K^{+}$ but passively exports ${3 Na}^{+}$

answer is D.

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Detailed Solution

The sodium-potassium pump is an active transport mechanism that moves three sodium ions (Na⁺) out of the cell and two potassium ions (K⁺) into the cell. This pump plays a crucial role in maintaining the electrochemical gradient across the cell membrane, contributing to the resting membrane potential and various cellular processes.

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