The electrical conduction system of the heart transmits signals generated usually by the sinoatrial node in the heart to cause contraction of the heart muscle.- Electrical conduction system of the heart
It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart.- Cardiac muscle
The wall of the heart is made up of three layers: epicardium, myocardium, and endocardium.- Heart
These generate a current that causes the heart to contract, traveling through the atrioventricular node and along the conduction system of the heart.- Heart
Other potential roles for fibroblasts include electrical insulation of the cardiac conduction system, and the ability to transform into other cell types including cardiomyocytes and adipocytes.- Cardiac muscle
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The sinoatrial node (also known as the sinuatrial node, SA node or sinus node) is a group of cells known as pacemaker cells, located in the wall of the right atrium of the heart.
These cells can produce an electrical impulse (action potential) that travels through the electrical conduction system of the heart, causing it to contract.
The main role of a sinoatrial node cell is to initiate action potentials of the heart that can pass through cardiac muscle cells and cause contraction.
The Purkinje fibers (often incorrectly ; Purkinje tissue or subendocardial branches) are located in the inner ventricular walls of the heart, just beneath the endocardium in a space called the subendocardium.
They are larger than cardiomyocytes with fewer myofibrils and many mitochondria.
Purkinje fibers allow the heart's conduction system to create synchronized contractions of its ventricles, and are essential for maintaining a consistent heart rhythm.
The contraction of cardiac muscle (heart muscle) in all animals is initiated by electrical impulses known as action potentials.
Sometimes an ectopic pacemaker sets the pace, if the SA node is damaged or if the electrical conduction system of the heart has problems.