Match the number on the wave to its function.
1: Number 4 on the wave above represents... ____
2: Number 1 on the wave above represents… ____

Question

BlackTom AI · Accepted Answer

To approach this matching question, I will evaluate what each labeled feature on a standard ECG waveform represents.
Option analysis for the pairings:
- Option: 'Ventricular polarization / rest phase' — This describes ventricular repolarization or the resting state of ventricles, which does not correspond to the main spike labeled 4 or any major deflection in the storm of a typical ECG. Since the large spike is associated with ventricular activity, this option misidentifies both the process and the phase.
- Option: 'Hyperpolarization' — Hyperpolarization is a term more often used in cellular electrophysiology rather than describing a phase of a standard ECG wave. It does not match the observable ECG features like the QRS complex or P wave. Therefore, this choice is incorrect in the context of ECG waveform labeling.
- Option: 'Atrial depolarization / contraction' — This corresponds to the P wave on an ECG, which is a small, rounded deflection preceding the big QRS complex. If the number 1 on the diagram marks a smaller wave before the main spike, this would be the correct match for atrial depolarization. However, the instruction is to identify 4 and 1 separately; we will verify against the diagram to assign correctly.
- Option: 'Ventricular depolarization / contraction of the ventricles' — This describes the QRS complex, the large rapid deflection seen here as the prominent spike labeled with number 4. It aligns with the ventricular depolarization process that triggers ventricular contraction.
- Option: 'Atrial polarization / rest phase' — This would correspond to a resting state of the atria or non-specific polarization, which is not a standard description of any distinct ECG wave. The P wave reflects atrial depolarization, not resting polarization, so this option is inaccurate.
Now, applying these insights to the specific numbers on the wave:
- Number 4 on the wave above represents... The tall, sharp deflection corresponds to the QRS complex, i.e., ventricular depolarization / contraction of the ventricles. This matches the correct physiological event for label 4.
- Number 1 on the wave above represents… The first smaller deflection before the big spike is the P wave, which indicates atrial depolarization / contraction. So the correct answer for label 1 is atrial depolarization / contraction.
In summary, the correct pairings are:
- 4 → Ventricular depolarization / contraction of the ventricles
- 1 → Atrial depolarization / contraction
The incorrect options above either describe different ECG components (like the P wave for atrial depolarization) or refer to concepts not typically mapped to standard ECG waves (rest polarization or hyperpolarization).

BIO 181 (001&002) FALL 2025 4C - Self-Check: Circulatory System: Conduction System (LO 4C.1, 4C.2, 4C.3, 4C.4)

Match the number on the wave to its function. 1: Number 4 on the wave above represents... 2: Number 1 on the wave above represents…

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Log in for full answers

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