the normal cardiac conduction cycle
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| isoelectric line before P wave equals | SA node firing
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| P wave equals | atrial depolarization
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| PR segment equals | av node delay, His, BBs, PFs
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| QRS complex equals | ventricular depolarization, muscle cells depolarize
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| ST segment equals | ventricular repolarization
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| T wave equals | ventricular repolarization
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| isoelectric line after T wave equals | resting phase; relaxation, filling
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| what papers speed is used when running an ECG? | 25 millimeters per second
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| 1 millimeter on the ECG paper equals how much time? | . 04 seconds
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| 1 millimeter equals how much voltage? | . 1 millivolts
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| 10 millimeters equals how many millivolts? | 1mv
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| one big box equals | .20 seconds
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| lower case letters represent | less than 5 boxes
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| uppercase letters represent | 5 boxes or more
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| The Q wave is the | first negative
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| the R wave is the | first positive
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| The S wave is the | first negative after first positive
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| the QRS complex duration is | less than. 10 seconds
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| A normal PR interval is | .12-. 20 seconds
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| the PR interval is made up of | the P wave and the PR segment
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| which wave represents atrial depolarization? | The P wave
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| which wave represents ventricular depolarization? | The QRS complex
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| which wave represents ventricular repolarization? | T waves
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