SAN

sinoatrial node
洞房(結節). 心臓のペースメーカー組織. 上大静脈と右心房の接合部の上にある.
sinoatrial node; or SA(sinoatrial) node; or nodus sinuatrialis; a tissue in the heart; the primary site of automaticity, from which the initial stimulus for muscle contraction spreads through the atrial muscula

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