Blastulation and Implantation | Embryology

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01:18 sec explains "The outer layer of trophoblast cells, resulting from compaction, pumps sodium ions into the blastocyst, which causes water to enter through osmosis and form the internal fluid-filled blastocyst cavity (blastocoel). The blastocoel, trophoblast cells, and inner cell mass are hallmarks of the blastocyst." Gilbert SF (2000). "Early Mammalian Development"