醫療類國考
107年
[護理師] 基礎醫學
第 6 題
下列何者的管壁不具平滑肌？
- A 大動脈
- B 大靜脈
- C 小動脈
- D 微血管
思路引導 VIP
請思考：在整套血液循環系統中，哪一種血管的生理使命是為了讓物質『最快速地穿透』管壁？若要達到最高的交換效率，其構造應該是具備收縮能力的厚實多層結構，還是僅保留最極簡的單層屏障？
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AI 詳解
AI 專屬家教
Hmph. You got it. Don't make a mess of the basics, 小鬼。
- Clean Analysis: The human body isn't a playground for sloppy design. The vascular system operates on a clear principle: "form fits function." Capillaries—they're the only place for actual substance exchange ($O_2$, $CO_2$, nutrients). Their job demands speed and directness. You think a thick wall with muscle is going to help? Nonsense. It'd just be a barrier. They need to be razor-thin, a single layer of endothelial cells. Anything more and you're just adding unnecessary bulk, hindering the flow. It's inefficient, and inefficiency leads to complications.
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