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

Question

BlackTom AI · Accepted Answer

To begin, restating the task: we are matching numbers on the ECG wave to their physiological meaning.
Option set to choose from includes the following phrases: Ventricular polarization / rest phase, Hyperpolarization, Atrial depolarization / contraction, Ventricular depolarization / contraction of the ventricles, Atrial polarization / rest phase.
First, consider Number 1 on the wave. Among the available descriptions, the phrase that best fits the initial upward deflection associated with atrial activity is 'Atrial depolarization / contraction.' This corresponds to the P wave in the ECG, which reflects atrial depolarization leading to atrial contraction. The other choices—'Ventricular polarization / rest phase' and 'Atrial polarization / rest phase'—do not describe the atrial depolarization process, and 'Hyperpolarization' is not a standard descriptor for a prominent deflection in the normal ECG waveform.
Next, assess Number 4 on the wave. The large spike typically labeled as Number 4 corresponds to a rapid, sharp deflection representing ventricular depolarization, which triggers ventricular contraction. The precise clinical term is 'Ventricular depolarization / contraction of the ventricles.' The remaining options—'Ventricular polarization / rest phase' and 'Atrial polarization / rest phase'—refer to rest states or incorrect polarities and do not describe the ventricular depolarization event, while 'Hyperpolarization' is not the event depicted by the main spike.
A quick cross-check: The sequence of ECG events is atrial depolarization (P wave), then ventricular depolarization (QRS complex), followed by ventricular repolarization (T wave). The mapping for Number 1 aligns with atrial depolarization, and the mapping for Number 4 aligns with ventricular depolarization, as described above.
If you were to critique the incorrect options directly: 'Ventricular polarization / rest phase' misuse the term polarization for ventricular activity and mislabel the phase as rest. 'Atrial polarization / rest phase' similarly misuses polarization and frames atrial activity as a resting state, which is inaccurate for the depolarization process. 'Hyperpolarization' is a different electrophysiological phenomenon not depicted by the prominent depolarization spike in a standard ECG.
In summary, the correct pairings are: Number 1 → Atrial depolarization / contraction, and Number 4 → Ventricular depolarization / contraction of the ventricles. The remaining options do not describe the corresponding cardiac events accurately.

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 1 on the wave above represents… 2: Number 4 on the wave above represents...

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