sinoatrial node
sinoatrial node (SA node) (sy-noh-ay-tri-ăl) n. the pacemaker of the heart: a microscopic area of specialized cardiac muscle located in the upper wall of the right atrium near the entry of the vena cava. Fibres of the SA node contract at around 70 times per minute. Following each contraction, the impulse spreads along connecting fibres to the atrioventricular node. Impulses arriving at the SA node accelerate or decrease the heart rate.
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systole , systole •biyearly, really, yearly •Beardsley • lawyerly • immediately •hourly • cowardly • surely • marbly •pebbly •neighbourly (US neighborly) •drib… Atrioventricular Node , atrioventricular node (AVN) A specialized group of cardiac muscle fibres situated in the fibrous ring between the right atrium and ventricle of the h… Dysrhythmia , Dysrhythmia
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Sinoatrial node