Question

QRS is related to
A. Ventricular contraction
B. Auricular contraction
C. Cardiac cycle
D. Auricular relaxation

Answer 1

Hint:- An electrocardiogram is detecting the electrical activity that is coming about within the heart. Under general circumstances, an electrical impulse will move from the sinoatrial node, spread across the atrium, to the atrioventricular node, and through the ventricular septum of the heart. This electrical impulse is a source the four chambers of the heart to contract and relax in a coordinated fashion. Studying these electrical impulses allows us to make sure how the heart is functioning.

Complete step-by-step solution:-
The QRS complex is made up of three waves Q wave, R wave, and S wave. These waves occur in quick succession. The QRS complex represents the electrical impulse as it travels through the ventricles and indicates ventricular depolarization. As with the P wave, the QRS complex begins just before ventricular contraction. It is important to know that not every QRS complex will contain Q, R, and S waves. The convention is that the Q wave is every time negative and that the R wave is the originally positive wave of the complex. If the QRS complex only contains an upward (positive) deflection, then it is an R wave. The S wave is the originally negative deflection after an R wave. In normal conditions, the duration of the QRS complex in an adult patient will be between 0.06 and 0.10 seconds. The QRS complex is normally positive in leads I, aVL, V5, V6 and II, III, and aVF. If the QRS complex is negative in leads aVR, V1, and V2.
Answer- As per the above discussion, the correct answer of this question is option A, Ventricular contraction.

Note:- The J-point or junction is the point where the QRS complex and the ST segment are met. The J-point is important because it can be used in the diagnosis of an ST-segment elevation myocardial infarction.