[{"data":1,"prerenderedAt":65},["ShallowReactive",2],{"q-nurse-114-2-basic-medicine-012":3},{"subject":4,"subjectSlug":5,"subjectFullName":6,"question":7,"related":35,"lastmod":64},"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-114-2-基礎醫學-012","nurse-114-2-basic-medicine-012",114,2,12,"鈣離子活化平滑肌細胞橫橋（cross-bridge）反應，下列何者為其主要作用？",{"A":15,"B":16,"C":17,"D":18},"旋轉肌凝素（tropomyosin）","旋轉素 C（troponin C）","肌動蛋白（actin）","肌球蛋白（myosin）","D",null,[],"本題考點在於平滑肌興奮收縮偶聯與骨骼肌的差異。依肌肉生理，平滑肌缺乏旋轉素（troponin）系統，鈣離子進入後與攜鈣素（calmodulin）結合，活化肌凝蛋白輕鏈激酶（MLCK），使肌球蛋白（myosin）輕鏈磷酸化而啟動橫橋循環，故主要作用對象為D肌球蛋白。A 肌凝素（tropomyosin）與B 旋轉素C屬骨骼肌的鈣調控蛋白，平滑肌不以其為機轉；C 肌動蛋白為細肌絲成分但非鈣活化的直接標的。故答案為D。","對比記憶——骨骼肌：Ca²⁺結合troponin C→移開tropomyosin→露出actin結合位（作用在細肌絲端）。平滑肌：Ca²⁺結合calmodulin→活化MLCK→磷酸化myosin輕鏈（作用在粗肌絲\u002Fmyosin端）。故平滑肌鈣調控落在肌球蛋白，這是本題與骨骼肌的分野。",[25,28,31,33],{"term":26,"count":27},"平滑肌收縮",3,{"term":29,"count":30},"攜鈣素calmodulin",1,{"term":32,"count":30},"MLCK",{"term":34,"count":30},"肌球蛋白磷酸化",[36,40,45,49,54,59],{"webId":37,"stem":38,"number":39,"year":10,"session":11},"nurse-114-2-basic-medicine-013","下列何者不是下運動神經元（lower motor neuron）損傷的表徵？",13,{"webId":41,"stem":42,"number":43,"year":44,"session":30},"nurse-115-1-basic-medicine-009","利尿劑主要作用機制為下列何者？",9,115,{"webId":46,"stem":47,"number":27,"year":48,"session":30},"nurse-106-1-basic-medicine-003","顴弓（zygomatic arch）是由顴骨與下列何者共同組成？",106,{"webId":50,"stem":51,"number":52,"year":53,"session":30},"nurse-107-1-basic-medicine-041","下列何者最容易出現在全胃切除（total gastrectomy）後發生貧血之患者？",41,107,{"webId":55,"stem":56,"number":57,"year":58,"session":11},"nurse-108-2-basic-medicine-005","脾臟的血液主要來自下列何者的分枝？",5,108,{"webId":60,"stem":61,"number":62,"year":63,"session":11},"nurse-109-2-basic-medicine-039","有關杭汀頓氏病（Huntington disease）的敘述，下列何者錯誤？",39,109,"2026-09-04",1788510758623]