Match each ECG wave or complex with the corresponding action in the cardiac cycle.
-atrial depolarization
A)QRS complex
B)P wave
C)T wave
D)U wave

Question

Quizplus · Accepted Answer

The P wave represents atrial depolarization, the electrical activity that causes the contraction of the atria.

Answer: A
 The QRS complex represents ventricular depolarization, the electrical activity that causes the contraction of the ventricles.

Answer: C
 The T wave represents ventricular repolarization, the electrical activity that allows the ventricles to relax and prepare for the next cycle.

Answer: D
 The U wave is not always present on an ECG and its significance is not well understood, although it is thought to represent repolarization of the papillary muscles or the Purkinje fibers. It is not typically associated with a specific action in the cardiac cycle.

Match Each ECG Wave or Complex with the Corresponding Action