Why potassium ions lower the heart rate


Discussion:

Affects of calcium, potassium and sodium on heart rate

I found that calcium ions don't change the heart rate dramatically and that potassium and sodium ions lower heart rate.
I am trying to figure out why this is though.

Please let me know:

1) Why calcium ions don't change the heart rate dramatically...

2) Why potassium ions lower the heart rate

3) Why sodium ions lower the heart rate.

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Biology: Why potassium ions lower the heart rate
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