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(B) The $ECG$ (Electrocardiogram) represents the electrical activity of the heart during a cardiac cycle:$1$. The $P$-wave represents the electrical e

Vedclass · Accepted Answer

$P$-wave: Contraction of both atria; $QRS$-complex: Contraction of both ventricles; $T$-wave: Diastole of all chambers.

Vedclass · Answer

(B) The $ECG$ (Electrocardiogram) represents the electrical activity of the heart during a cardiac cycle:$1$. The $P$-wave represents the electrical excitation (depolarization) of the atria,which leads to the contraction of both atria.$2$. The $QRS$-complex represents the depolarization of the ventricles,which initiates ventricular contraction. This contraction starts shortly after the $Q$ and marks the beginning of the systole.$3$. The $T$-wave represents the return of the ventricles from an excited to a normal state (repolarization). The end of the $T$-wave marks the end of systole and the beginning of ventricular diastole (relaxation of all chambers).

Select the correct option for $ECG$.

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