SA node acts as a pacemaker of the heart because of the fact that it_________________?
Correct answer: D. Generates impulses at the highest rate
- A. is capable of generating impulses
- B. Has rich sympathetic innervation
- C. Has poor cholinergic innervation
- D. Generates impulses at the highest rate
Explanation
The SA node normally sets the rhythm because its pacemaker cells have the highest rate of spontaneous depolarisation. Other pacemaker sites are suppressed by this faster SA-node discharge.
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