On an electrocardiogram, which of the following represents ventricular depolarization and re-polarization?
a. P–R interval c. ST segment
b. Q–T interval d. QRS complex
ANS: B
The Q–T interval is measured from the beginning of the QRS complex to the end of the T wave. It represents the time required for ventricular depolarization and repolarization to occur and also approximates the time of ventricular systole.
Health Professions
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What are the first arteries to branch off the ascending aorta?
a. Brachiocephalic b. Carotid c. Coronary d. Subclavian
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