2025newtalk 國中生物單元四: 人體的物流通路-血管

概述人體循環系統中動脈、靜脈與微血管三種主要血管的結構、功能與流體力學差異。首先回顧威廉·哈維如何推翻蓋倫血液被消耗的古老理論，確立了血液循環的概念。接著詳細說明動脈作為高壓運輸通道，擁有最厚、最具彈性的管壁來緩衝心臟搏動並維持血流。隨後解釋微血管的結構極致簡化，僅有一層細胞壁，其總截面積最大導致血流最慢，這對物質交換至關重要。最後內容描述靜脈是低壓回收與儲血庫，其特徵是管壁較薄且含有瓣膜，用以對抗重力確保血液回流。聽完後可以自主進行線上測驗，檢視學習成效喔~(需要登入gemini) 測驗網址 https://gemini.google.com/share/7edf7f3b7732 Powered by Firstory Hosting

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2025newtalk 國中生物單元四: 人體的物流通路-血管

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