The heart can contract independently because cardiac muscle contains specialized tissue that generates impulses. Its conducting system includes the sinoatrial node (SA node), the atrioventricular node (AV node), the bundle of His, the left and right bundle branches, and Purkinje fibres.
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| File Name | The-Conducting-System-of-The-Heart.pptx |
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The Conducting System of The Heart PPT Summary
- The SA node is the heart’s primary pacemaker, generating impulses at a rate of approximately 70 beats per minute.
- The AV node significantly delays impulse conduction, allowing effective ventricular filling before contraction.
- The His bundle is essential for transmitting impulses from the atria to the ventricles, overcoming the fibrous separation of these chambers.
- The Purkinje fibres enable rapid conduction within the ventricles, ensuring synchronized contraction.
- Damaged conduction pathways can cause arrhythmias, and possible interventions include using artificial pacemakers to regulate heart rhythm.
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