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猫胚胎发育初期的营养来自哪里
更新时间: 2020-09-06 00:00:00  

精子与卵细胞在输卵管处相遇并结合形成受精卵,随后受精卵开始发育成最初的胚胎,此时发育的营养物质来自卵黄。

当胚胎到达子宫后着床,此后通过胎盘交换的营养物质来自母体,同时将代谢废物经母体排出。

所以,胚胎发育初期就是受精卵,营养来自卵黄。随后胎盘形成才从母体汲取营养。

关键词: 胚胎 发育 初期 营养 来自 哪里

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