[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"kakomon-q-2023-ippan-7":3},{"slug":4,"exam_year":5,"exam_round":6,"section":7,"section_code":8,"number":9,"body":10,"choices":11,"correct_indices":28,"explanation":29,"has_explanation":18,"tags":30},"2023-ippan-7",2023,1,"一般","ippan",7,"心臓の拍動で最初に興奮が始まる部位はどれか。",[12,15,19,22,25],{"index":6,"body":13,"is_correct":14},"心尖部",false,{"index":16,"body":17,"is_correct":18},2,"洞房結節",true,{"index":20,"body":21,"is_correct":14},3,"房室結節",{"index":23,"body":24,"is_correct":14},4,"プルキンエ線維",{"index":26,"body":27,"is_correct":14},5,"ヒス束",[16],"正答は2（洞房結節）。心臓の拍動は、右心房にある洞房結節（ペースメーカー）で最初に興奮が始まり、房室結節→ヒス束→プルキンエ線維へ伝わる。1心尖部・3房室結節・4プルキンエ線維・5ヒス束は、いずれも洞房結節より後に興奮が伝わる部位。よって最初は洞房結節。**覚え方**: 心臓のペースメーカー＝洞房結節。ここから刺激伝導系（房室結節→ヒス束→プルキンエ）へ。",null]