sinoatrial node the heart
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sinoatrial node the heart |
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| navigate by keyword : aorta arteries arterioles artery atria atrioventricular atrium blood capillaries chambers cycle deoxygenated electrical endocardium epicardium heart impulse lungs myocardium node organ oxygenated oxygenrich pulmonary pulse pump signal signals sinoatrial tissue tricuspid upper veins ventricle ventricles venules |
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| The SA sinoatrial node generates an electrical signal that causes the upper heart chambers atria to contract. The signal then passes through the AV atrioventricular node to the lower heart chambers ventricles, causing them to contract, or pump. The SA node is considered the pacemaker of the heart.
The heart's natural pacemaker ââ¬â the SA node ââ¬â sends out regular electrical impulses from the top chamber (the atrium) causing it to contract and pump blood into the bottom chamber (the ventricle). The electrical impulse is then conducted to the ventricles through a form of 'junction box' called the AV node. |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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