洞どう房ぼう結けっ節せつ

noun

sinoatrial node

Medical term for the heart's natural pacemaker, located in the right atrium.

• 洞どう房ぼう結けっ節せつは心しん臓ぞうの拍はく動どうを開かい始しする組そ織しきです。

  The sinoatrial node is the tissue that initiates the heartbeat.