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Glossary of Physiology Terms
The main cation (positively charged ion) of the extracellular fluid.
) plays an important role in several physiological processes such as the action potential
of neurons and muscle cells, secondary active, sodium-coupled transport
of ions, nutrients, neurotransmitters across the plasma membrane of cells, and many other processes.
The extracellular concentration of Na+
is about 145 mM. The intracellular concentration of Na+
is about 15 mM.
Posted: Wednesday, February 5, 2014
Last updated: Wednesday, February 5, 2014