Illustration: Sa Node And Av Node In The Heart
ID 174972104 © 7activestudio | Megapixl.com
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.
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KEYWORDS
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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