Which of the following correctly explains


Which of the following correctly explains a phase/ event in the cardiac cycle

in a standard electrocardiogram?

a. QRS complex indicates atrial contraction.

b. QRS complex indicates ventricular contraction.

c. The time between S and T represents atrial systole.

d. P-wave indicates the beginning of ventricular contraction.


Option (b)  QRS complex indicates ventricular contraction is the answer.

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