ANATOMY
CHEST AND CARDIOVASCULAR
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
atrial repolarization
|
|
atrial depolarization
|
|
ventricular repolarization
|
|
ventricular depolarization
|
Detailed explanation-1: -The P wave and PR segment is an integral part of an electrocardiogram (ECG). It represents the electrical depolarization of the atria of the heart. It is typically a small positive deflection from the isoelectric baseline that occurs just before the QRS complex.
Detailed explanation-2: -Final answer: Depolarization of atria is represented by P-wave.
Detailed explanation-3: -âPâ wave is the first wave in an ECG and is a positive wave. It indicates the activation of the SA nodes. âTâ wave too is a positive wave and is the final wave in an ECG though sometimes an additional U wave may be seen. It represents ventricular relaxation.
Detailed explanation-4: -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.