Question

Describe the physiological events occurring in the heart muscle represented by each ECG component (the P wave, QRS complex, and T wave). Why does the QRS complex have the largest amplitude?

Answer 1

# Physiological events occurring in the heart muscle represented by each ECG component:

* Every single beat of the heart involves three major phases. They include

* cardiac diastole, when chambers are relaxed and filling passively;

*atrial systole when the atria contract leading to ventricular filling;

* ventricular systole; when blood is ejected into both the pulmonary artery and aorta.

* P wave 0.07 33

* QRS complex 0.7932

* T wave 0.15- 0.27

* The QRS complex is ventricular depolarization and atrial repolarization.

* The T wave is ventricular repolarization.

* The P wave represents the depolarization of the left and right atrium and also corresponds to atrial contraction.

# * The QRS complex have the largest amplitude corresponds to the largest wave, since it represents the depolarization of the right and left ventricles, being the heart with substantial mass.

* The QRS complex indicates ventricular depolarization.

*Depolarization triggers contraction of the ventricles.

* Because of the larger tissue mass, the QRS complex is larger than the P wave.

* A wide QRS complex refers to a QRS complex duration greater than or equal 120 ms.

*Widening of the QRS complex is related to slower spread of ventricular depolarization, either due to the disease of the His- Purkinjie network and or slower, muscle- muscle spread of depolarization. So, thereby QRS complex have the largest amplitude.