Question

The T-wave of an ECG indicates:

• A. Atrial contraction
• B. Ventricular contraction
• C. Ventricular repolarization
• D. Atrial depolarization

Hint:

The T-wave marks the end of the ventricular systole. If the T-wave is flat or inverted, it may indicate myocardial ischemia (lack of oxygen to the heart muscle).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
An Electrocardiogram (ECG) records the electrical impulses that travel through the heart. Each wave corresponds to a specific electrical event that triggers a mechanical action (contraction or relaxation).

Step 2: Detailed Explanation:
A standard ECG consists of three main components:
1. P-wave: Represents atrial depolarization, which is the electrical signal that triggers the contraction of the atria.
2. QRS complex: Represents ventricular depolarization, which is the electrical signal that triggers the contraction of the ventricles (systole).
3. T-wave: Represents ventricular repolarization. This is the stage where the ventricular muscle cells recover from their excited state and return to their resting state, which leads to ventricular relaxation.

Step 3: Final Answer:
The T-wave is indicative of ventricular repolarization.