斑馬魚在成長的時候大多處於相對透明的狀態,其器官生長的過程可以說是亳無保留地呈現在眾人眼前。413Please respect copyright.PENANANyruogWUqK
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對於專門研究生長機制的科學家來說,班馬魚絕對是一道非常方便用於研究的動物模型。413Please respect copyright.PENANAcN6yI7jb4J
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(圖2)約於受精後24小時,班馬魚的心臟亦將形成,且能收縮膨脹把紅血球送遍全身。413Please respect copyright.PENANAmzn2yng3Pf
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有科學家嘗試把一氧化碳注進水裡,試圖透過一氧化碳與紅血球的結合,抑制紅血球輸送氧氣的能力,從而探討初生時候的紅血球有甚麼功用。413Please respect copyright.PENANAjsu03Mbpi3
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結果可謂出人意表,就算利用一氧化碳抑制紅血球輸氧的能力,頭5日內,斑馬魚依舊能吸取及耗用氧氣,其耗氧量跟對照組合並無分別。413Please respect copyright.PENANA2wIcvWi1Y1
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(圖3)從圖中可見,隨著生長時數推展,班馬魚的心臟跳動速度亦有所增長,但無論是否注入一氧化碳,其跳動速度亦無太大的分別。413Please respect copyright.PENANAbtKRh3u0Zw
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這相信是因為頭5日的班馬魚體積非常微細,氧氣能夠透過自然擴散的方式進入班馬魚內部,並不需要紅血球的任何協助。413Please respect copyright.PENANA7Y6jpUd66g
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既然頭5日氧氣輸送並不需要紅血球的協助,那為何在受精的第一日後便已發展出撲撲跳的心臟呢?413Please respect copyright.PENANAe5SjK3qdJd
除了氧氣後,電解質或營養等物質均需透過血液循環系統輸送,它們自然擴散的效率比氧氣為低,需要依靠澎湃的心臟經由血管送到各部位內外。413Please respect copyright.PENANA8zOASjcil0
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Ref1:https://pubmed.ncbi.nlm.nih.gov/8756015/
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