- Answer: (C) Upper Lateral Wall of Right Atrium
- Explanation: The sinoatrial (SA) node is a small, specialized region of tissue located in the upper right atrium of the heart. It acts as the primary pacemaker, initiating electrical impulses that regulate the heartbeat.
(A) 250-350 GM
(B) 250-300 GM
(C) 350-450 GM
(D) 300-400 GM
Correct Anser (D) 300-400 grams.
(A)Bundie Of HIS
(B) SA Node
(C) AV Node
(D) Purkinje Fibers
- Answer: (B) SA Node
- Explanation: The SA node is the “natural pacemaker” because it generates the fastest rate of depolarization compared to other parts of the cardiac conduction system. This rapid depolarization sets the pace for the entire heartbeat.