The functioning of the two cardiac cells, the cardiac myocyte and pacemaker cells differ in their function. In order, the pacemaker cell responds first, and then the cardiac myocyte cells respond to the pacemaker cell.

Each cell has its own unique action potential in response to a flow of ions in and out of the cell. Compare and contrast the differences in action potentials of the two contrasting cells of the heart. Explain in your own words why it is necessary that these two cells have different action potentials.

In essay form, describe in your own words, citing properly, the phases of the action potentials for these two cells, including the ion flow in sequence and its ion potential as the cells move from phase to phase.

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