If ectopic impulses are occurring in the heart at a rate that is faster than the SA node,
A. the rate at which the SA node fires controls the ectopic rate.
B. the SA node impulses control the atria, and the ectopic impulses control the ventricles.
C. the ectopic and SA node impulses cancel each other, resulting in atrial fibrillation.
D. the ectopic beat overrides the SA node and causes the atria and ventricles to depolarize.
Answer: D
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