Which of the following correctly explains a phase/event in …

Biology Body Fluids and Circulation NCERT Examplar Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 26, 2026

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

The QRS complex indicates atrial contraction.

The QRS complex indicates ventricular contraction.

The time between S and T represents atrial systole

The P–wave indicates the beginning of ventricular contraction.

Text Solution

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The correct answer is:

(b)

QRS complex indicates ventricular contraction QRS Complex QRS wave (complex) begins after a fraction of second after the P wave. It begins as a small downward deflection (Q) and continues as a large upright (R) and triangular wave, ending as downward wave (S) at its base. This represents ventricular depolarization (ventricular contraction). Thus, the other options are wrong.

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