Which part of the pacemaker is primarily responsible for pacing operations?

The circuitry of the pacemaker is primarily responsible for pacing operations because it contains the electronic components that generate electrical impulses. These impulses stimulate the heart's myocardium, promoting contraction and regulating heart rhythms. The circuitry processes information from the leads, which sense the heart's intrinsic activity and relay that information back to the pacemaker. Based on this data, the circuitry determines when to deliver pacing pulses to maintain an appropriate heart rate and rhythm.

The battery provides the necessary power for the circuitry to function, but it does not directly control pace and timing of the heartbeats. The leads connect the pacemaker to the heart, allowing for the delivery of impulses and sensing of cardiac signals, but they do not produce the pacing itself. Connectors are simply the physical points of attachment between the leads and the pacemaker, facilitating the connection but not impacting the pacing functions directly. Thus, the circuitry plays a crucial role in orchestrating the entire pacing operation.