Physiology – MCQ 65 – SA node as pacemaker

S.A. node acts as a pacemaker of the heart because of the fact that it:
A. Is capable of generating impulses spontaneously
B. Has rich sympathetic innervations
C. Has poor cholinergic innervations
D. Generates impulses at the highest rate

Correct answer : D. Generates impulses at the highest rate

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