The approximate intracellular concentration of sodium ions (Na⁺) in a typical human cell is usually around 10-15 mM (millimolar). However, this concentration can vary depending on the cell type and specific physiological conditions. In contrast, the extracellular concentration of Na⁺ is significantly higher, typically around 135-145 mM. This gradient is crucial for various cellular processes, including action potentials in neurons and muscle contraction.
3 What is the approximate concentration of Na* inside a cell (intracellular concentration)?
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