On a Normal ECG, a Wave for Repolarization of the Atria

question 218

Multiple Choice

On a normal ECG, a wave for repolarization of the atria is not recorded. Why?

• A) the leads are not placed in a position to pick it up.
• B) no repolarization of the atria occurs normally.
• C) it occurs simultaneously with ventricular depolarization and is masked by the QRS complex.
• D) it does not travel through body fluids.
• E) it is too small to be picked up by external recording electrodes.

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