Pacemaker of the heart is situated
In the wall of left atrium close to opening to pulmonary veins
In the wall of right atrium close to superior vena cava
On interauricular septum
On the interventricular septum
Conducting system of the human heart
wherein,
Sinoatrial node or SA node
It includes a mass of specialised self excitatory cells present in the wall of the right atrium near the opening of superior vena cava.
SA node is also called as the pacemaker of the heart because of its involvement in the initiation of heartbeat impulses
SA node initiates impulses more rapidly than any other neuromuscular cells of heart.
Hence, the correct answer is option b.