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。549Please respect copyright.PENANASjw2dJBOI6549Please respect copyright.PENANAmWJTPeLORn
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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。549Please respect copyright.PENANAEObsU2MoMf
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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。549Please respect copyright.PENANAZiVKjWe10o549Please respect copyright.PENANAIp6ZLQfSiF
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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。549Please respect copyright.PENANAhtKhsvVaHJ
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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。549Please respect copyright.PENANAG7NrxvCKO9
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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。549Please respect copyright.PENANAT0vzntIP0f549Please respect copyright.PENANAT8EYU8kNaz
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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。549Please respect copyright.PENANAIea7T1mchm
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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?549Please respect copyright.PENANAn47wdTJdXo
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。549Please respect copyright.PENANANmQ5Awy2Zq
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Ref1:https://pubmed.ncbi.nlm.nih.gov/8756015/
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