Question

question 4 of 10
which of the following structures is known as the \pacemaker of the heart\?
bundle of his
av or atrioventricular node
bundle branches
sa or sinoatrial node

Explanation:

The SA (sinoatrial) node initiates the electrical impulses that regulate the heartbeat, earning it the title "pacemaker of the heart". The other structures are also part of the heart's conduction system but do not serve as the primary initiator of the heartbeat.

Answer:

SA or sinoatrial node