Final answer:
The correct answer is ventricular repolarization. During this phase, the ventricles are relaxing and preparing for the next contraction. The patient should lie still and refrain from talking to ensure accurate readings.
Step-by-step explanation:
The correct answer is b) ventricular repolarization.
Ventricular repolarization is the phase of the cardiac cycle where the ventricles are relaxing and preparing for the next contraction. During this phase, the ventricular muscles regain their resting potential by repolarizing, meaning they restore their electrical charge after depolarization.
To ensure accurate readings during this phase, it is important for the patient to lie still and refrain from talking as any movement or noise could impact the electrocardiogram (ECG) measurements.