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

Question & Answer Discuss:

The given figure represents diagrammatic presentation of an ECG. Each peak in the ECG is identified with a letter from P to T that corresponds to a specific electrical activity of the heart. Which of the following letter shows the incorrect activity of heart?

(a) R wave - Marks the beginning of the systole.

(b) QRS - Depolarization of the ventricles

(c) P- Electrical excitation (or depolarization) of the atria

(d) T wave - Return of the ventricles from excited to normal state (repolarization).