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Q.

Sodium-potassium pump

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a

actively transports 3 Na+ outwards for 2K+ into the cell 

b

actively exports 3 Na+ but passively imports  2K+

c

actively transports 2K+ outwards for 3 Na+ into the cell

d

actively imports 2K+ 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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