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Q498:針對胎兒胚胎發育成身體各器官及構造中，下列何者是 ...

懷孕的前九週為胚胎期，此時的胚胎將逐漸轉化為胎兒，而奠定胎兒器官發育的有三層胚胎，外胚胎將演化成大腦及脊髓的中樞神經系統；中胚胎是心臟、血液循環系統、骨骼及 ...

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