A sodium-potassium antiport maintains the extracellular concentration of sodium at levels that are about 20-30 times higher than inside the cells. What directly supplies the energy for maintaining this gradient? Select one: a. Potassium supplies the energy, as it is moving along its concentration gradient. b. Sodium supplies the energy, as it is moving along its concentration gradient. c. ATP hydrolysis drives the function of the pump. d. A proton gradient in the mitochondria drives the antiport. Check (Q008) Which of the following ions has a low cytosolic concentration so that a flood of this ion into the cell can be used as a signal for cell processes like fertilization? Select one: a. Ca2+ b. H+ c. K+ d. phosphate
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Step 1: The sodium-potassium antiport uses ATP hydrolysis to pump sodium out of the cell and potassium into the cell against their concentration gradients. Show more…
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The major function of the sodium-potassium pump is to: a. pump Na+ into and K+ out of the cell. b. generate the resting membrane potential. c. maintain the concentration gradients of Na+ and K+ across the plasma membrane. d. oppose any tendency of the cell to undergo hyperpolarization.
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If a cell were placed in a solution with a high potassium concentration and no sodium, what would happen to the sodiumpotassium pump's activity? a. It would stop moving ions across the membrane. b. It would continue using ATP to pump sodium out of the cell and potassium into the cell. c. It would move sodium and potassium ions across the membrane, but no ATP would be used. d. It would reverse the direction of sodium and potassium ions to move them against their gradients.
If you wanted to stop the function of the sodium-potassium pump in a neuron, you could starve the cell of ATP because this pump is driven by a. phagocytosis. b. simple diffusion. c. active transport. d. facilitated diffusion. e. osmosis.
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