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The concentration of Calcium in a resting cell is ___________

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The concentration of Calcium in a resting cell is ___________

(a) 10 M

(b) 10^-2 M

(c) 10^-5 M

(d) 10^-7 M

I got this question in homework.

My question is taken from Cell Signaling and Signal Transduction topic in section Cell Signaling and Signal Transduction of Cell Biology

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Right choice is (d) 10^-7 M

To explain I would say: The concentration of Calcium ions in a resting cell is usually maintained at very low levels, approximately 10^-7 M. However, outside the cells (extracellular space) in the ER lumen or a plant cell vacuole, the concentration is much higher.

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