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The Conduction System
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An Incredible Machine: The Conduction System 

An Incredible Machine
Bonus poster (PDF)
The Conduction System

 
 

 The New Project Heart - heart anatomy illustrations and animations for grades K-6.
Heart anatomy illustrations and animations
for grades K-6.

The Conduction System
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Illustration of the heart's conduction system


Electrical impulses from your heart muscle (the myocardium) cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the right atrium. The SA node is sometimes called the heart's "natural pacemaker." When an electrical impulse is released from this natural pacemaker, it causes the atria to contract. The signal then passes through the atrioventricular (AV) node. The AV node checks the signal and sends it through the muscle fibers of the ventricles, causing them to contract.

The SA node sends electrical impulses at a certain rate, but your heart rate may still change depending on physical demands, stress, or hormonal factors.

See also on this site: Bundle Branch Block

See also on other sites:

MedlinePlus
www.nlm.nih.gov/medlineplus/ency/imagepages/18052.htm
Conduction system of the heart


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Texas Heart Institute Heart Information Center
Through this community outreach program, staff members of the Texas Heart Institute (THI) provide educational information related to the prevention, diagnosis, and treatment of cardiovascular disease. It is not the intention of THI to provide specific medical advice, but rather to provide users with information to better understand their health and their diagnosed disorders. Specific medical advice will not be provided and THI urges you to visit a qualified physician for diagnosis and for answers to your questions.
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