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SA nodepacemaker of heart that fires at 60 - 100 bpmif it's not working well the ventricles (60 - 40 bpm) and AV node (40 - 20 bpm) take over
begninning of one heartbeat to the beginning of the next
atrial contraction propels blood into the ventricles
ventricles contract and push blood into the arteries
provides different views of the heart12 leads provides 12 views
- "flat line"
- no positive or negative wave defelctions
represents atrial depolarization
time it takes the electrical impulse to travel from the sa node to teh av node
represents ventricular depolarization
time it takes for the electrical impulse to travel from the AV node through the ventricles
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