Questions: PRACTICE IT What does the P wave represent in an ECG waveform? The electrical activity associated with the atrial contraction (atrial depolarization). The electrical activity associated with the ventricular relaxation (ventricular repolarization). The electrical activity associated with the contraction of the Purkinje fibers. The electrical activity associated with the ventricular contraction (ventricular depolarization). The electrical activity associated with the atrial relaxation (atrial repolarization).

PRACTICE IT What does the P wave represent in an ECG waveform? The electrical activity associated with the atrial contraction (atrial depolarization). The electrical activity associated with the ventricular relaxation (ventricular repolarization). The electrical activity associated with the contraction of the Purkinje fibers. The electrical activity associated with the ventricular contraction (ventricular depolarization). The electrical activity associated with the atrial relaxation (atrial repolarization).
Transcript text: PRACTICE IT What does the P wave represent in an ECG waveform? The electrical activity associated with the atrial contraction (atrial depolarization). The electrical activity associated with the ventricular relaxation (ventricular repolarization). The electrical activity associated with the contraction of the Purkinje fibers. The electrical activity associated with the ventricular contraction (ventricular depolarization). The electrical activity associated with the atrial relaxation (atrial repolarization).
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Solution

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The answer is the first one: the electrical activity associated with the atrial contraction (atrial depolarization).

Explanation for each option:

  1. The electrical activity associated with the atrial contraction (atrial depolarization).

    • This is correct. The P wave in an ECG waveform represents the depolarization of the atria, which leads to atrial contraction.

  2. The electrical activity associated with the ventricular relaxation (ventricular repolarization).

    • This is incorrect. Ventricular repolarization is represented by the T wave in an ECG waveform.

  3. The electrical activity associated with the contraction of the Purkinje fibers.

    • This is incorrect. The Purkinje fibers are involved in the conduction system of the heart, but their activity is not specifically represented by a distinct wave in the standard ECG. Their activity contributes to the QRS complex, which represents ventricular depolarization.

  4. The electrical activity associated with the ventricular contraction (ventricular depolarization).

    • This is incorrect. Ventricular depolarization is represented by the QRS complex in an ECG waveform.

  5. The electrical activity associated with the atrial relaxation (atrial repolarization).

    • This is incorrect. Atrial repolarization is not typically visible on a standard ECG because it occurs during the QRS complex and is overshadowed by the larger electrical activity of ventricular depolarization.

Summary: The P wave in an ECG waveform represents the electrical activity associated with atrial contraction (atrial depolarization).

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