Question: 1. When a P wave is shown on a normal ECG graph, what events are occurring in the heart? 2. What is being measured on

1. When a P wave is shown on a normal ECG graph, what events are occurring in the heart? 

2. What is being measured on the X-axis and the Y-axis on the ECG?

3. What part of the conduction pathway is in the atria and what parts are in the ventricles?

4. If SA node is not working, would atrial tissue depolarize? 

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