[{"data":1,"prerenderedAt":66},["ShallowReactive",2],{"q-nurse-107-1-basic-medicine-019":3},{"subject":4,"subjectSlug":5,"subjectFullName":6,"question":7,"related":38,"lastmod":65},"基礎醫學","basic-medicine","基礎醫學(包括解剖學、生理學、病理學、藥理學、微生物學與免疫學)",{"id":8,"webId":9,"year":10,"session":11,"subject":4,"number":12,"stem":13,"options":14,"answer":19,"answerNote":20,"images":21,"explanation":22,"explanationDeep":23,"topics":24,"freq":27},"nurse-107-1-基礎醫學-019","nurse-107-1-basic-medicine-019",107,1,19,"當迷走神經興奮時，對心臟的影響下列何者正確？",{"A":15,"B":16,"C":17,"D":18},"心跳速率變慢、電位衝動傳導速度變快","心跳速率變快、電位衝動傳導速度變慢","心跳速率與電位衝動傳導速度皆變慢","心跳速率與電位衝動傳導速度皆不變","C",null,[],"本題考點是迷走神經（副交感）興奮對心臟的雙重抑制作用。依自主神經生理，迷走神經末梢釋出乙醯膽鹼作用於竇房結與房室結的 M₂ 受體，同時使心跳速率變慢（負性頻率）與房室傳導速度變慢（負性傳導），故選 C。A、B 各只對一半且方向矛盾（傳導不會因迷走興奮而變快），D 稱皆不變與副交感作用相反。判斷關鍵在於認得迷走對心臟為「速率、傳導雙降」。","迷走神經釋 ACh →活化 M₂ 受體→打開 GIRK 鉀通道使竇房結細胞超極化、第 4 相去極化變慢（心跳慢），並抑制房室結鈣內流延長傳導（PR 延長）。這是負性頻率（chronotropy）、負性傳導（dromotropy）、負性收縮（inotropy）三重抑制。臨床連結：頸動脈竇按摩、Valsalva 動作經迷走反射減慢心率，可用於陣發性室上心搏過速的處置背景知識。",[25,28,31,34,36],{"term":26,"count":27},"乙醯膽鹼",8,{"term":29,"count":30},"房室結傳導",3,{"term":32,"count":33},"迷走神經",2,{"term":35,"count":33},"竇房結",{"term":37,"count":11},"負性頻率\u002F傳導",[39,43,47,52,56,61],{"webId":40,"stem":41,"number":42,"year":10,"session":11},"nurse-107-1-basic-medicine-020","下列何種情況會使神經元產生去極化（depolarization）現象？",20,{"webId":44,"stem":45,"number":46,"year":10,"session":33},"nurse-107-2-basic-medicine-036","慢性骨髓性白血病與下列那一個基因有關？",36,{"webId":48,"stem":49,"number":50,"year":51,"session":11},"nurse-108-1-basic-medicine-050","下列何種抗癲癇藥物，其結構類似 GABA？",50,108,{"webId":53,"stem":54,"number":27,"year":55,"session":33},"nurse-109-2-basic-medicine-008","拔牙前，醫生進行局部麻醉以阻斷下列何者之傳導來減少疼痛？",109,{"webId":57,"stem":58,"number":59,"year":60,"session":33},"nurse-110-2-basic-medicine-052","動情素在臨床上用來治療攝護腺癌，是因為下列何種藥理作用？",52,110,{"webId":62,"stem":63,"number":46,"year":64,"session":11},"nurse-112-1-basic-medicine-036","有機硝酸鹽用於治療及預防穩定型心絞痛，劑量大時會導致周邊阻力減少，引發反射性心跳加快，因此常與下列那類藥物合併使用來避免心絞痛惡化？",112,"2026-09-04",1788510700997]