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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 of the other cells in the heart's electrical conduction system.
Jan 31, 2020 · The following 54 files are in this category, out of 54 total. 2018 Conduction System of Heart.jpg 2,021 × 1,354; 1.03 MB. 2019 Cardiac ConductionN.jpg 1,421 × 1,426; 575 KB. Action Potentials.jpg 1,546 × 887; 323 KB. Basic representation of cardiac conduction.gif 325 × 297; 760 KB.
Cardioversion is a medical procedure by which an abnormally fast heart rate (tachycardia) or other cardiac arrhythmia is converted to a normal rhythm using electricity or drugs. Synchronized electrical cardioversion uses a therapeutic dose of electric current to the heart at a specific moment in the cardiac cycle , restoring the activity of the ...
Heart block. Heart block ( HB) [1] is a disorder in the heart 's rhythm due to a fault in the natural pacemaker. [2] This is caused by an obstruction – a block – in the electrical conduction system of the heart. Sometimes a disorder can be inherited. Despite the severe-sounding name, heart block may cause no symptoms at all in some cases ...
So, electrical conduction in the heart refers to the electrical signals that go from cell to cell in the heart. This happens in the form of action potentials, which get sent out by the pacemaker cells in the heart. The pacemaker cells, also called conducting cells, are a relatively tiny group -- only about 1% of the heart cells -- but they’re ...
In the heart's conduction system electrical activity that originates from the sinoatrial node (SAN) is propagated via the His-Purkinje network, the fastest conduction pathway within the heart. The electrical signal travels from the sinoatrial node, which stimulates the atria to contract, to the atrioventricular node (AVN) , which slows down ...
Nov 14, 2022 · With third-degree heart block, the heart does not contract properly, and it can’t pump blood out to the body effectively. Third-degree heart block may be caused by: Certain medications; A heart attack that damages the heart’s electrical conduction system; Heart surgery; Heart diseases, such as heart valve disease; Some infections, such as ...
