单词	sinoatrial node
释义	sinoatrial node noun : sinus node Word History First Known Use 1913, in the meaning defined above Medical Definition sinoatrial node noun : a small mass of tissue that is made up of Purkinje fibers, ganglion cells, and nerve fibers, that is embedded in the musculature of the right atrium of higher vertebrates, and that originates the impulses stimulating the heartbeat called also S-A node, sinus node
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