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15 Cards in this Set
- Front
- Back
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A visual record of the hearts electrical changes during each cardiac cycle.
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Electrocardiogram
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Atrial systole-contraction->depolarization
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P wave
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When P wave is created
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Atrial depolarization
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Ventricular depolarization
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QRS Complex
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The fast Na+ channels automatically inactivate and Na+ inflow decreases
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Rapid ventricular depolarization
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ventricular depolarization
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T Wave
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Due to the closure of Ca2+ channels and K+ outflow when additional voltage-gated K+ channels open.
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ventricular repolarization
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Time from the beginning of the P wave to the beginning of the QRS complex. It represents the conduction time from atrial to ventricular excitation.
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P-Q interval
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Begins at the end of S wave and ends at beginning of T wave. Represents the time when the ventricular contractile fibers are depolarized during the platequ phase of the action potential.
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S-T segment
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Extends from the start of the QRS complex to the end of the T wave. It is time from beginning of ventricular depolarization to the end of ventricular repolarization.
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Q-T interval
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Atrial systole & diastole rapidly followed by ventricular systole and diastole.
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cardiac cycle
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contraction
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atrial systole
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volume in the ventricle at the end of a diastole-130ml blood.
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End diastolic volume (EDV)
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Lasts about 0.3 seconds when the ventricles are contracting.
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ventricle systole
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relaxation
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atrial diastole
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