New Ex 7.5 - Heart Sounds Exercise 7.5 Keyterms Systole...

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Heart Sounds Exercise 7.5
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Keyterms Systole – contraction of ventricles Diastole – relaxation of the ventricles Ausculation – listening
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Heart Sounds There are two main heart sounds, “lub” and “dub” To hear “lub” place stethoscope in 5 th left intercostal space (by mitral valve) To hear “dub” place stethoscope in 2 nd intercostal space (can listen on right or left side) Ventricular systole → AV valves shut → causes first sound “lub” of the heart - (At the end of the QRS complex on ECG) Ventricular diastole → SL valves shut causes second sound “dub” of the heart – (At the end of the T wave on ECG)
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QRS(T) COMPLEX P wave- depolarization of atria QRS complex- depolarization of ventricles Changes in the QRS duration or amplitude can mean different diseases or disorders. Inverse P- repolarization of the atria are hidden by the QRS complex. (much smaller in magnitude.
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