When the electrical signal leaves the AV node, it triggers the following process: The electrical signal then moves on to trigger your ventricles. The AV node briefly slows down the electrical signal, giving the ventricles time to receive the blood from the atria. The atria contract, pumping blood into your left and right ventricles.ДЄfter the electrical signal has caused your atria to contract and pump blood into your ventricles, the electrical signal arrives at a group of cells at the bottom of the right atrium called the atrioventricular node, or AV node.The signal triggers the muscle cells that make your atria contract.The electrical signal travels from your SA node through muscle cells in your right and left atria.When the SA node sends an electrical impulse, it triggers the following process: This cycle of an electrical signal followed by a contraction is one heartbeat. The SA node sends another signal to the atria to contract, which starts the cycle over again.The lower heart chambers (ventricles) contract or pump.The AV node sends an impulse into the ventricles.The upper heart chambers (atria) contract.The SA node (called the pacemaker of the heart) sends out an electrical impulse.In a healthy heart, the signal travels very quickly through the heart, allowing the chambers to contract in a smooth, orderly fashion. The signal then travels down through your heart, triggering first your two atria and then your two ventricles. The electrical signal starts in a group of cells at the top of your heart called the sinoatrial (SA) node. As cell after cell rapidly transmits the electrical charge, the entire heart contracts in one coordinated motion, creating a heartbeat.

The signal is able to travel along these pathways by means of a complex reaction that allows each cell to activate one next to it, stimulating it to 'pass along' the electrical signal in an orderly manner. The electrical signal travels through the network of conducting cell 'pathways,' which stimulates your upper chambers (atria) and lower chambers (ventricles) to contract.

Muscle cells enable your heart's chambers to contract, an action triggered by your heart's electrical signal.

Conducting cells carry your heart's electrical signal.

Two different types of cells in your heart enable the electrical signal to control your heartbeat: Your heart's electrical system controls the timing of your heartbeat by sending an electrical signal through these cells. How does the heart's electrical system work? See a picture of the heart and its electrical system.

An orderly contraction of your atria and ventricles (this is called a sinus rhythm).

The heart's electrical system also increases this rate to meet your body's needs during physical activity and lowers it during sleep.

A steady heart rate of 60 to 100 beats per minute at rest.

Your heart's electrical system should maintain:

Heart rhythm, which is the synchronized pumping action of your four heart chambers.Heart rate, which is the number of times your heart beats per minute.Your heart's electrical system controls the timing of your heartbeat by regulating your: Topic Overview What controls the timing of your heartbeat?

Where the heart leads ending