The concentration of calcium in the cytosol of cells is very much lower than the concentration of extracellular calcium.

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Quizplus · Accepted Answer

This statement is true. The concentration of calcium in the cytosol of cells is typically around 100 nM (nanomolar), while the concentration of extracellular calcium is around 2 mM (millimolar), which is about 20,000 times higher. Cells use various mechanisms to maintain this concentration gradient, which is important for many cellular processes.

The Concentration of Calcium in the Cytosol of Cells Is