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The sinoatrial node functions as the heart's pacemaker due to its specialized tissue that produces impulses at the fastest rate.

1. It is situated in the right atrium.
2. It produces impulses at a slower rate.
3. It produces impulses at the fastest rate.
4. It is situated in the left atrium.

Correct answer: It produces impulses at the fastest rate.

Solution

The SA node is called the pacemaker of the heart because it generates electrical impulses at the highest rate compared to other parts of the conduction system, ensuring rhythmic heart contractions.

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