sentence: Calcium ions are important to cells, but too many calcium ions can be bad.
sentences_after: If a cell gets more calcium ion than it needs it can die. This is why the amount of calcium ion in cells is highly regulated. Conversely, not enough calcium ion is bad. Cells must have the right amount to function properly.
concept_name: calcium ion
headings: Calcium Occurrence Calcium in cells
categories: Alkaline earth metals