NEET Biology Body Fluids And Circulation Based Practice Questions & Answers with Viewers Discussion and Detailed Explanation

Question & Answer Discuss:

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

(a) The QRS complex indicates ventricular contraction.

(b) The QRS complex indicates atrial contraction.

(c) The time between S and T represents atrial systole

(d) The P–wave indicates the beginning of ventricular contraction.