![]() It delays the signal by a consistent amount of time (a fraction of a second) each time. The atrioventricular node delays the SA node’s electrical signal. Parasympathetic nervous system (rest and digest response) makes your SA node work slower, which decreases your heart rate.Sympathetic nervous system (fight or flight response) makes your SA node work faster, which increases your heart rate.The autonomous nervous system includes your: For example, your heart rate increases during exercise and slows when you are asleep. This part of the nervous system directs hormones that control your heart rate based on what you are doing. Your autonomic nervous system controls how fast or slowly your SA node sends electrical signals. It is at the edge of your atrium near your superior vena cava (vein that brings oxygen-poor blood from your body to your heart). The SA node is in the upper part of your heart’s right atrium. It sends the electrical impulses that start the heartbeat. Your sinoatrial node is sometimes called your heart’s natural pacemaker. Bundle of His (atrioventricular bundle).Your cardiac conduction system contains specialized cells and nodes that control your heartbeat. It also helps your heart speed up when you need more blood and oxygen or slow down when it’s time to rest.ĭiagram of the cardiac conduction system What are the parts of the cardiac conduction system? Ideally, the electrical conduction system keeps up a steady, even heart rate. These contractions control how blood flows through your heart. The electrical signals that travel through your heart conduction system cause your heart to expand and contract. How does electrical conduction perform with the rest of your heart? ![]() Your heart conduction system sends out thousands of signals per day to keep your heart beating. These steps make up one full contraction of your heart muscle. The Purkinje fibers to your ventricles (bottom heart chambers), causing them to contract.The bundle of His (center bundle of nerve fibers), carrying the signal to the Purkinje fibers.The atrioventricular (AV) node, delaying the signal until your atria are empty of blood.Your atria (top heart chambers), telling them to contract.This electrical signal is like electricity traveling through wires to an appliance in your home. It starts when your sinoatrial (SA) node creates an excitation signal. For each heartbeat, electrical signals travel through the conduction pathway of your heart. Your heart is a pump that sends blood through your body. What are the steps of the heart conduction pathway?
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