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## Functions - begins when it gets an electrical impulse from the SA node - The rhythm of the heart contractions is set by the AV node. It delays the impulse by about 0.12 seconds. - This is delay is very important as it helps the atria eject the blood in them into the ventricles before the contrac...

## Functions - begins when it gets an electrical impulse from the SA node - The rhythm of the heart contractions is set by the AV node. It delays the impulse by about 0.12 seconds. - This is delay is very important as it helps the atria eject the blood in them into the ventricles before the contraction of the ventricles. - The delay also helps in protecting the ventricles from atrial arrhythmia (type of arrhythmia). - Sends the signal it receives to the fibers below, opens the semilunar, blood is forced out ## Bundle of His It is a cluster of cells that extends outward from the AV node and travels down the center of your heart. Because these conduct electricity faster than surrounding tissue, it functions much like a lightning rod, directing the electrical cascade further into the heart. - The fascicular branches then lead to the Purkinje fibers which provide electrical conduction to the ventricles, causing the cardiac muscle of the ventricles to contract at a paced interval. - Basically directs orders to branches that allow a Heart to contract. These branches that the His bundle directs, are the Purkinje fibers.