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Study Notes

T Wave in Normal ECG

Represents repolarization of the ventricles in the heart.
Typically appears as a positive deflection following the QRS complex.
In a healthy ECG, the T wave is asymmetrical, with a slower rise and a steeper descent.

QRS Complex in Normal ECG

Caused by the depolarization of the ventricles, leading to their contraction.
Represents a rapid influx of sodium ions into cardiac muscle cells.
Composed of three distinct waves: Q wave (initial negative deflection), R wave (tall positive deflection), and S wave (subsequent negative deflection).

Potential Difference During Repolarization

The potential difference between two electrodes decreases as potassium ions exit the cardiac muscle fiber.
This change helps return the membrane potential to its resting state.

Differences Between Depolarization and Repolarization Waves

Depolarization waves (e.g., QRS complex) are rapid and result in muscle contraction.
Repolarization waves (e.g., T wave) are slower, indicating relaxation of the cardiac muscle.

Cause of the T Wave

Caused by the outflow of potassium ions from cardiac muscle cells during ventricular repolarization.
Reflects the electrical activity as the heart muscle resets for the next cycle.

Composition of the QRS Complex

Made up of Q wave, R wave, and S wave, each representing different phases of ventricular depolarization.
Typically lasts between 0.06 to 0.1 seconds in a normal ECG.

Description

Test your knowledge of ECG basics with this quiz! Learn about the normal components of an ECG, including the P wave, QRS complex, and T wave. Challenge yourself to identify the different waves and understand their underlying electrical potentials. Get ready to become an ECG expert!