P-Wave: Atrial Depolarisation & Contraction—NEET Biology
✅ Asked in NEET 2024Match List I with List IIList I A. P wave B. QRS complex C. T wave D. T-P gap List II I. Heart muscles are electrically silent II. Depolarisation of ventricles III. Depolarisation of atria IV. Repolarisation of ventricles
Match List I with List IIList I A. P wave B. QRS complex C. T wave D. T-P gap List II I. Heart muscles are electrically silent II. Depolarisation of ventricles III. Depolarisation of atria IV. Repolarisation of ventricles
In standard ECG diagram, the P-wave represents:
Match List I with List II.List I A. P-wave B. Q-wave C. QRS complex D. T-wave List II I. Beginning of systole II. Repolarisation of ventricles III. Depolarisation of atria IV. Depolarisation of ventricles
Match the Column - I with Column - II. (NEET 2019) Column I (A) P-wave (B) QRS complex (C) T-wave (D) Reduction in the size of T-wave Column II (i) Depolarisation of ventricles (ii) Repolarisation of ventricles (iii) Coronary ischaemia (iv) Depolarisation of atria (v) Repolarisation of atria
Answer & NCERT explanation
Correct answer: D — A–III, B–II, C–IV, D–I
ECG waves represent: P wave = atrial depolarization (A-III), QRS complex = ventricular depolarization (B-II), T wave = ventricular repolarization (C-IV), T-P gap = electrical silence when heart muscles are at rest (D-I). This is standard ECG interpretation from NCERT cardiovascular chapter.
Read more NCERT concept on the PYQ
The P-wave represents the electrical excitation (or depolarisation) of the atria, which leads to the contraction of both the atria.
The P-wave on an ECG specifically records the electrical depolarisation (activation) of the atria, causing both atria to contract simultaneously. Students often confuse P-wave with atrial contraction itself—remember that the wave represents the electrical signal that *triggers* contraction, not the mechanical pumping. NTA tests this because understanding the sequence of electrical events in the heart is fundamental to interpreting ECG patterns. Key point: P-wave = atrial depolarisation, QRS = ventricular depolarisation, T-wave = ventricular repolarisation. Since this concept appears repeatedly in NEET, expect questions asking what the P-wave represents or which part of the heart shows activity during P-wave deflection.
What does NCERT say about P-wave represents electrical excitation?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.