Which Statement About Calcium Ions Is True

question 159

Multiple Choice

Which statement about calcium ions is true?

• A) Calcium ions are more concentrated in the cytoplasm than outside the cell.
• B) Active transport maintains the concentration differences between intracellular and extracellular levels of calcium ions.
• C) A cell can increase intracellular concentrations of calcium ions by making more calcium.
• D) Inositol trisphosphate (IP₃) is the only signal that causes calcium ion channels to open.
• E) Calcium ions are involved in signal transduction but do not function as second messengers.

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