This is the reason why the SA node acts as heart’s pacemaker

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Question:This is the reason why the SA node acts as heart’s pacemaker

1.because it has a poor cholinergic innervations

2.because it has a rich sympathetic innervations

3.because of its capability of generating impulses

4. because it generates impulses at the highest rate

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  1. This is the reason why the SA node acts as heart’s pacemaker
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