北京
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ID：xinji65
許多科普讀物稱小腸是最長的器官。但事實上，血管才是真正最長的。雖然中學生物課本未明確血管是器官，但闡明了器官定義：由兩種或以上不同類型組織構成，行使特定功能，承擔生物體內一定工作。
血管完全符合此定義。組織學上，其管壁由不同組織構成的同心層組成：內膜包含內皮細胞層及薄層結締組織；中膜為中間的肌肉/彈性層，含平滑肌和彈性組織；外膜主要是外層纖維結締組織。神經組織在血管中雖不占主導，但參與調節平滑肌與痛覺。
因此醫學上，血管與胃、腸、膀胱、腎等具有較大內腔的結構同屬管狀器官。
所以，最長的器官并非小腸，而是血管。
參考資料
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