Which Statement Best Describes Why Atrial Depolarization Is Usually Not

question 118

Multiple Choice

Which statement best describes why atrial depolarization is usually not detected on a normal ECG?

• A) It occurs at the same time as the QRS complex.
• B) The electrodes cannot be placed high enough on the chest to detect the atria.
• C) The voltage change in the atria is minimal and therefore does not register on an ECG.
• D) The atria are so small and the depolarization happens so quickly that it cannot be detected.
• E) The atria do not contract only the AV valves open.

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