Extracellular calcium has approximately the same concentration as the intra-organelle-stored calcium. Approximately what is this concentration? A) 10^-1M B) 10^-3 M C) 10^-6 M D) 10^-9 M E) 10^-12 M

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The concentration of extracellular calcium is approximately 10^-3 M, which is much higher than the intracellular concentration but similar to the concentration within certain organelles that store calcium.

Extracellular Calcium Has Approximately the Same Concentration as the Intra-Organelle-Stored