What Is The Physiological Salt Concentration In Animal Cells
periodical article
Philosophical Transactions: Biological Sciences
, pp. 263-269 (7 pages)
Published By: Royal Club
https://www. jstor .org/stable/56222
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Plant cells and bacterial cells are surrounded by a massive cellulose wall, which constrains their high internal osmotic pressure (tens of atmospheres). Animal cells, in contrast, are in osmotic equilibrium with their surround, have no restraining surroundings, can take on a variety of shapes and change these from moment to moment. This osmotic balance is accomplished by the action of the free energy-consuming sodium pump, ane of the P-type ATPase transport protein family, members of which are indeed also found in bacteria. The pump's activeness brings almost a transmembranal electrochemical gradient of sodium ions, harnessed in a range of transport systems that couple the dissipation of this gradient to establishing a gradient of the coupled substrate. The primary function of the sodium pump as a regulator of cell volume has evolved to provide the footing for an enormous variety of physiological functions.
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Philosophical Transactions: Biological Sciences © 1995 Royal Society
Source: https://www.jstor.org/stable/56222
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