Question:
The waves associated with the electrical activity of the various parts of the heart tissue during each cardiac cycle are represented by letters P, Q, R, S, T and U. Which of these wave represent ventricular repolarization ?
The waves associated with the electrical activity of the various parts of the heart tissue during each cardiac cycle are represented by letters P, Q, R, S, T and U. Which of these wave represent ventricular repolarization ?
Show Hint
A handy summary for ECGs:
P wave = Atrial Depolarization.
QRS complex = Ventricular Depolarization.
T wave = Ventricular Repolarization.
P wave = Atrial Depolarization.
QRS complex = Ventricular Depolarization.
T wave = Ventricular Repolarization.
Updated On: Jul 31, 2026
- P wave
- Q wave
- S wave
- T wave
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Concept:
The question asks to identify the specific waveform on an Electrocardiogram (ECG/EKG) trace that corresponds to the physiological event of ventricular repolarization.
Step 2: Step-by-step Explanation:
• An Electrocardiogram (ECG) is a graphical representation of the sequential electrical activity traversing the heart muscle during a single heartbeat.
• P wave: This is the first small upward deflection. It is generated by the depolarization of the atria initiated by the Sinoatrial (SA) node, which immediately precedes atrial contraction.
• QRS complex (comprising Q, R, and S waves): This is the largest, sharpest spike on the trace. It signifies the rapid and massive electrical depolarization of the right and left ventricles just prior to powerful ventricular systole (contraction). It physically masks the tiny electrical signal of atrial repolarization occurring simultaneously.
• T wave: Following the QRS complex, there is a slightly slower, broader upward deflection called the T wave. This wave graphically represents the phase of ventricular repolarization. During this phase, the ventricular muscle fibers electrically reset (restore their resting membrane potential) in preparation for the next subsequent heartbeat.
• U wave: Sometimes a small U wave follows the T wave, which is thought to represent the repolarization of the Purkinje fibers or papillary muscles, though it is often absent.
• Since the question specifically identifies ventricular repolarization, the answer is definitively the T wave.
Step 3: Final Answer:
The T wave uniquely corresponds to ventricular repolarization on an ECG trace.
The question asks to identify the specific waveform on an Electrocardiogram (ECG/EKG) trace that corresponds to the physiological event of ventricular repolarization.
Step 2: Step-by-step Explanation:
• An Electrocardiogram (ECG) is a graphical representation of the sequential electrical activity traversing the heart muscle during a single heartbeat.
• P wave: This is the first small upward deflection. It is generated by the depolarization of the atria initiated by the Sinoatrial (SA) node, which immediately precedes atrial contraction.
• QRS complex (comprising Q, R, and S waves): This is the largest, sharpest spike on the trace. It signifies the rapid and massive electrical depolarization of the right and left ventricles just prior to powerful ventricular systole (contraction). It physically masks the tiny electrical signal of atrial repolarization occurring simultaneously.
• T wave: Following the QRS complex, there is a slightly slower, broader upward deflection called the T wave. This wave graphically represents the phase of ventricular repolarization. During this phase, the ventricular muscle fibers electrically reset (restore their resting membrane potential) in preparation for the next subsequent heartbeat.
• U wave: Sometimes a small U wave follows the T wave, which is thought to represent the repolarization of the Purkinje fibers or papillary muscles, though it is often absent.
• Since the question specifically identifies ventricular repolarization, the answer is definitively the T wave.
Step 3: Final Answer:
The T wave uniquely corresponds to ventricular repolarization on an ECG trace.
Was this answer helpful?
0
0
Top CUET PG Medical Laboratory Technology Questions
- What is the main function of myosin
- Which heart sound is sharp short and caused by the sudden closure of semilunar valves
- Which enzyme curdles the milk and converts caseinogens first into paracaseinogen and then into calcium paracaseinate
- What is the main source of energy for skeletal muscle ?
- Muscle of forearm is divided into which groups ?
View More Questions
Top CUET PG Cardiology Questions
- In Rheumatic heart disease, which valve has highest probability of deformation?
Normal wave pattern of ECG wave form is shown in the figure below. Identify the missing wave from the wave form.
- Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : The conduction in the Atrio-ventricular (AV) node is slow i.e. 0.05 m/sec, there is a delay of approx. 0.1 second before excitation spreads to the ventricles.
Reason (R) : AV node delay enables the atria to empty the blood present within them into the ventricles before these contract.
In the light of the above statements, choose the most appropriate answer from the options given below : - The correct order of systemic circulation in a heart :
A. Aorta
B. Aortic valve
C. Left ventricle
D. Superior and inferior venae cavae
E. Right atrium
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions