When implantation begins, the trophoblastic cells of the blastocyst are responsible for providing food to the developing embryo.

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During implantation, the trophoblastic cells of the blastocyst attach to the uterine lining and begin to form the placenta. These cells are responsible for providing nutrients to the developing embryo until the placenta is fully formed and functional.

When Implantation Begins, the Trophoblastic Cells of the Blastocyst Are