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 下图是胎儿发育期间营养供应的相关结构图,据图回答下列问题。 ( 1 )请标出 B 和 C 的名称: [B]________ , [C]________ 。 ( 2 )受精卵分裂和胚胎发育初期的营养由 ___________ 提供。 ( 3 )胚胎植入子宫内壁后,在胚胎与子宫壁接触的部分形成 [A]___________ 。 ( 4 )胎儿通过 [A] 和 [B] ,从母体内获得 ______ ,并将代谢产生的 __________ 气体和其他废物排入母体的血液,由母体排出。
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