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sinkerball
sinkhole
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sinoatrial
sinoatrial node
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sinoatrial node

si·no·a·tri·al node (plural si·no·a·tri·al nodes)


noun 
Definition:
 
specialized tissue in heart: a small mass of specialized cardiac muscle fibers in the wall of the right atrium of the heart which originates the regular electrical impulses that stimulate the heartbeat

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