Multiple Choice
Which of the following is not considered a transporter?
9. Transport Across Membranes
Transporters
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The sodium-potassium pump works by doing what?
A
Pumping one sodium ion into the cell, while pumping one potassium ion out of the cell
B
Pumping one sodium ion out the cell, while pumping one potassium ion into the cell
C
Pumping three sodium ion into the cell, while pumping two potassium ion out of the cell
D
Pumping three sodium ion out the cell, while pumping two potassium ion into the cell
Verified step by step guidance1
Understand the function of the sodium-potassium pump, which is a type of active transport mechanism found in the plasma membrane of cells.
Recognize that the sodium-potassium pump is crucial for maintaining the electrochemical gradient across the cell membrane, which is essential for various cellular processes.
The pump works by using energy from ATP to move ions against their concentration gradients. Specifically, it moves sodium (Na⁺) and potassium (K⁺) ions in opposite directions.
For each cycle of the pump, three sodium ions (Na⁺) are transported out of the cell, while two potassium ions (K⁺) are transported into the cell.
This movement of ions helps maintain a higher concentration of sodium ions outside the cell and a higher concentration of potassium ions inside the cell, which is vital for functions such as nerve impulse transmission and muscle contraction.
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