an energy-consuming mechanism in cell membranes that transports sodium ions across the membrane, in exchange for potassium ions or other substances.
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Origin of sodium pump
First recorded in 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for sodium pump
A biologic mechanism that uses metabolic energy stored in ATP to achieve active transport of sodium ions across a membrane, such as the cell membrane or the multicellular membranes that make up the walls of renal tubules.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.