BLOOD CARDIOVASCULAR SYSTEM LYMPHOID ORGANS
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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depolarization of the atria
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repolarization of the atria and depolarization of the ventricles
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depolarization of both atria and ventricles
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repolarization of the blood vessels
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Detailed explanation-1: -The QRS complex represents the depolarization of ventricles. It shows the beginning of systole and ventricular contraction. The QRS complex or wave starts with a small deflection downwards, represented by the point Q. It follows the P wave.
Detailed explanation-2: -Atrial depolarization is reflected by the P wave, and ventricular depolarization is reflected by the QRS complex, whereas the T wave reflects ventricular repolarization, see Figure 6.10. Atrial repolarization cannot usually be discerned from the ECG since it coincides with the much larger QRS complex.
Detailed explanation-3: -Ventricular depolarization and activation is represented by the QRS complex, whereas ventricular repolarization (VR) is expressed as the interval from the beginning of the QRS complex to the end of the T wave (QT interval). VR is a complex electrical phenomenon which has been studied in detail[2, 3].
Detailed explanation-4: -A combination of the Q wave, R wave and S wave, the “QRS complex” represents ventricular depolarization.
Detailed explanation-5: -Atrial and ventricular depolarization and repolarization are represented on the ECG as a series of waves: the P wave followed by the QRS complex and the T wave.