Biology / Bio 0803 · Atom · ~20 seconds
Calcium as a Second Messenger
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Calcium ions serve as a second messenger because active pumps keep cytoplasmic concentration low at rest, so a gated channel opening produces a sharp, detectable rise.
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Calcium signaling triggers insulin release in pancreatic beta-cells, while the same rise triggers contraction in muscle cells.
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Calcium's effect depends on which proteins a cell type expresses — the ion carries no built-in instruction.