MCQ – 81323

Action potential generates at fastest rate in‑

A.	SA node
B.	AV node
C.	Bundle of His
D.	Purkinje fibers

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Correct Answer � A Explanation

Ans. A. SA node

• SA node discharges impulses at fastest rate, hence the rate at which SA node fires determines the heart rate, therefore,
• SA node is normal pacemaker of the heart, i.e., it determines the pace of the heart.