Which of the following statements about calcium is true? A) Calcium ions are more concentrated inside than outside the cell. B) Active transport maintains the concentration difference of calcium ions. C) A cell can increase intracellular concentrations of calcium by making more calcium. D) IP₃ is the only signal that causes calcium channels to open. E) It inhibits cell division in fertilized eggs.

Question

Quizplus · Accepted Answer

Calcium ions are more concentrated outside the cell than inside, and active transport maintains this gradient by pumping calcium out of the cell. A cell cannot make more calcium, and IP₃ is not a real signal. While calcium can inhibit cell division, this is not a statement about its general properties.

Which of the Following Statements About Calcium Is True