sodium-potassium pump
American Heritage Dictionary:
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so·di·um-po·tas·si·um pump
(sō'dē-əm-pə-tăs'ē-əm) 
n.
A mechanism of active transport that moves potassium ions into and sodium ions out of a cell.
n.
A mechanism of active transport that moves potassium ions into and sodium ions out of a cell.
American Heritage Stedman's Medical Dictionary:
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sodium-potassium pump
n.
The enzyme-based mechanism that maintains correct cellular concentrations of sodium and potassium ions by removing excess ions from inside a cell and replacing them with ions from outside the cell.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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