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گره دهلیزی- بطنی
Atrioventricular node
Contraction of the heart muscle is controlled by the cardiac conducting system, which consists of the sinoatrial node, atrioventricular node, and atrioven- tricular bundle of His (Figure 8-4).
The atrioventricular node receives the impulse from
The sinus venosus functions early as the pacemaker of the conducting system of the heart and is the precur- sor to the sinoatrial node, atrioventricular node, and bundle of His.
By age 60, the number of pacemaker cells in the sino- atrial node begins to decrease; by age 75, less than 10% of the number of sinoatrial node cells found in the adult heart are seen.29,30 Cellular loss is also noted in the atrioventricular node and bundle of His.
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