Ion Movements Across the Cell Membrane Are Recorded Coupled with Changes

Ion movements across the cell membrane are recorded coupled with changes in membrane potential in an isolated heart muscle cell (see graph below) . . Which of the following ion sequences corresponds to regions 1-2-3 on the graph, respectively?

A) Potassium, sodium, calcium
B) Sodium, calcium, potassium
C) Calcium, sodium, chloride
D) Calcium, sodium, potassium
E) Sodium, potassium, calcium

Correct Answer:

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