Electrical conduction system of the heart | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-28

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Electrical_conduction_system_of_the_heart


00:00:56 1 Structure
00:02:43 1.1 Development
00:03:26 2 Function
00:03:35 2.1 Action potential generation
00:05:06 2.2 Requirements for effective pumping
00:07:01 3 ECG
00:07:17 3.1 SA node: P wave
00:08:03 3.2 AV node and bundles: PR interval
00:09:51 3.3 Purkinje fibers/ventricular myocardium: QRS complex
00:10:30 3.4 Ventricular repolarization
00:12:38 4 Clinical significance
00:12:48 4.1 Arrhythmia
00:13:08 4.1.1 Speed
00:13:35 4.1.2 Physiological
00:14:34 4.2 Pacemakers



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SUMMARY
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The electrical conduction system of the heart transmits signals generated usually by the sinoatrial node to cause contraction of the heart muscle. The pacemaking signal generated in the sinoatrial node travels through the right atrium to the atrioventricular node, along the Bundle of His and through bundle branches to cause contraction of the heart muscle. This signal stimulates contraction first of the right and left atrium, and then the right and left ventricles. This process allows blood to be pumped throughout the body.
The conduction system consists of specialised heart muscle cells, and is situated within the myocardium. There is a skeleton of fibrous tissue that surrounds the conduction system which can be seen on an ECG. Dysfunction of the conduction system can cause irregular, fast, or slow heart rhythms.