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URL：https://lh6.ggpht.com/-qnc22-JPkTo/UsQ9hZJQn-I/AAAAAAAAA1U/epmg0Ypp-0w/sa%2520node%2520and%2520av%2520node%2520of%2520heart_thumb%255B4%255D.jpg?imgmax=800 掲載元：https://ar.inspiredpencil.com/pictures-2023/sinoatrial-node-and-atrioventricular-node
