Physiology – MCQ 65 – SA node as pacemaker

Collection of Medicine MCQs (Cardiovascular system) for medical students. Concept based MCQs with detailed explanations which help students to gain valuable insights and gain an edge in competitive examinations. More than just answering MCQs, the explanations will improve the knowledge and understanding about the conditions discussed. Also useful for MD students who are preparing for Superspeciality entrance examinations. Medicine MCQs - Cardiovascular System Kindle Edition: Click Here for a Preview. Comments and suggestions are most welcome.

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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