[{"data":1,"prerenderedAt":65},["ShallowReactive",2],{"q-nurse-108-2-basic-medicine-019":3},{"subject":4,"subjectSlug":5,"subjectFullName":6,"question":7,"related":34,"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-108-2-基礎醫學-019","nurse-108-2-basic-medicine-019",108,2,19,"若血壓維持不變，血管半徑變為原來的兩倍，此時流經此條血管的血流量將變為：",{"A":15,"B":16,"C":17,"D":18},"2 倍","4 倍","8 倍","16 倍","D",null,[],"本題考點為血流量與血管半徑的關係,依循Poiseuille定律。該定律指出血流量與血管半徑的四次方成正比,當半徑變為原來的兩倍,血流量即變為2的四次方即16倍,故選D。A「2倍」誤把血流量與半徑當成一次方正比。B「4倍」誤以為與半徑平方成正比。C「8倍」誤以為與半徑三次方成正比。判斷關鍵在於牢記Poiseuille定律中半徑的指數是「四次方」而非一、二或三次方,因此半徑加倍會使血流量激增為16倍,這也說明血管口徑的微小變化即能劇烈改變血流。","Poiseuille定律:Q=(πΔP r⁴)\u002F(8ηL),血流量Q正比於壓力差ΔP與半徑四次方r⁴,反比於黏滯度η與管長L。半徑的四次方效應解釋了為何小動脈(阻力血管)的輕微舒張或收縮就能大幅調控組織血流與血壓——半徑加倍→16倍,減半→1\u002F16。臨床連結:此原理也說明為何靜脈注射選用較粗的導管(如16G)能顯著提升輸注速率。記憶要點:「半徑四次方,牽一髮動全身」。",[25,28,30,32],{"term":26,"count":27},"Poiseuille定律",1,{"term":29,"count":27},"血流量與半徑四次方",{"term":31,"count":27},"血管阻力",{"term":33,"count":27},"半徑加倍16倍",[35,39,44,48,53,58],{"webId":36,"stem":37,"number":38,"year":10,"session":11},"nurse-108-2-basic-medicine-020","下列有關肌原纖維（myofibril）的敘述，何者正確？",20,{"webId":40,"stem":41,"number":42,"year":43,"session":27},"nurse-109-1-basic-medicine-036","下列何者不是引發血管內靜水壓上升的原因？",36,109,{"webId":45,"stem":46,"number":47,"year":43,"session":11},"nurse-109-2-basic-medicine-050","下列抗心律不整的藥物，何者會延長動作電位的間期，且甲狀腺機能異常者需小心使用？",50,{"webId":49,"stem":50,"number":51,"year":52,"session":27},"nurse-111-1-basic-medicine-008","下列管道何者不開口於右心房？",8,111,{"webId":54,"stem":55,"number":56,"year":57,"session":11},"nurse-112-2-basic-medicine-032","下列何種藥物的清除半衰期（elimination half-life）最長？",32,112,{"webId":59,"stem":60,"number":61,"year":62,"session":63},"nurse-113-3-basic-medicine-026","血液中何種白血球增多與過敏性疾病（allergic diseases）最相關？",26,113,3,"2026-09-04",1788510704940]