Which part of the intrinsic conduction system normally initiates the depolarizing impulse that causes a heartbeat? View Available Hint(s) SA node AV node Internodal pathway AV bundle

The SA node, or sinoatrial node, is often referred to as the heart's natural pacemaker! This small cluster of specialized cells is located in the right atrium and initiates the electrical impulses that trigger each heartbeat. It's like the conductor of a musical symphony, coordinating the rhythm and ensuring that your heart beats at a comfortable pace, typically around 60 to 100 beats per minute. On the other hand, if the SA node fails to function properly, the AV node takes over but at a slower rate. This backup system helps keep the heart beating, though it may not be as efficient as when the SA node is in charge. Think of it as a backup band stepping in for the lead singer when things go a bit off-key; the music may still play, but the tempo changes!