Conductive System|| S.A Node, A.V Node, Bundle of HIS, Purkinje fibers|| for NEET, Medical, Nursing
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- Опубликовано: 31 май 2021
- In This Class We Will Discuss About Conductive System|| S.A Node, A.V Node, Bundle of HIS, Purkinje fibers|| for NEET, Medical, Nursing
Conducting system of heart (Complexus stimulans cordis) 1/4. The cardiac conduction system is a network of specialized cardiac muscle cells that initiate and transmit the electrical impulses responsible for the coordinated contractions of each cardiac cycle.
The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart). The electrical impulses are generated there. The SA node is also called the sinus node
The AV node is a highly specialized conducting tissue (cardiac, not neural in origin) that slows the impulse conduction considerably (to about 0.05 m/sec)
The bundle of His branches into the left and the right bundle branches, which run along the interventricular septum. The left bundle branch further divides into the left anterior and the left posterior fascicles. These bundles and fascicles give rise to thin filaments known as Purkinje fibers.
The Purkinje fibers are specialized conducting fibers composed of electrically excitable cells. They are larger than cardiomyocytes with fewer myofibrils and many mitochondria. They conduct cardiac action potentials more quickly and efficiently than any other cells in the heart.
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