Calcium waves are intracellular calcium ions that can travel from cell to cell to propagate a specific signal. It occurs in electrical conducting cells such as heart cells, neurons and astrocytes. But they can occur in just about any cell population. They travel from cell to cell via gap junctions, connexons, and other ion channels. The above is a calcium wave extending out like a rock thrown into water. They are VERY fast and short lived. The photo intervals in the above were less than half a second.
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