Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The ventricular ejection phase generally correlates with the S-T segment and the T wave on the ECG.
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18. The Heart
Electrocardiogram (ECG)
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What does the small P wave on an ECG indicate?
A
Ventricular depolarization
B
Ventricular repolarization
C
Atrial repolarization
D
Atrial depolarization
Verified step by step guidance1
Understand the components of an ECG: An electrocardiogram (ECG) is a test that records the electrical activity of the heart. It consists of several waves, each representing different phases of the cardiac cycle.
Identify the P wave: The P wave is the first wave in the ECG cycle. It is a small, rounded wave that appears before the QRS complex.
Learn the significance of the P wave: The P wave represents atrial depolarization, which is the electrical activity that triggers the contraction of the atria, the upper chambers of the heart.
Differentiate between depolarization and repolarization: Depolarization refers to the process of electrical activation of the heart muscle, while repolarization is the process of returning to the resting state.
Conclude the role of the P wave: Since the P wave is associated with atrial depolarization, it indicates the initiation of the electrical impulse that leads to the contraction of the atria.
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