The implantation of the blastocyst in the uterine wall marks the transition between which two consecutive periods of prenatal development?

Question

BlackTom AI · Accepted Answer

The question asks about an event in prenatal development and which two consecutive periods are separated by the implantation of the blastocyst into the uterine wall.
Option 1: 'fetal period and zygotic period' is incorrect because the zygotic period occurs from fertilization through implantation, while the fetal period begins later in development; their order and boundaries do not align with blastocyst implantation.
Option 2: 'germinal period and embryonic period' is the correct pairing. The germinal (or pre-implantation) period spans from fertilization to implantation, and the embryonic period begins with implantation and continues through organ formation; implantation marks the transition between these two stages.
Option 3: 'embryonic period and fetal period' would imply a transition from embryonic to fetal development, which occurs later after major organogenesis; implantation is not the boundary between these two stages.
Option 4: 'germinal period and fetal period' would suggest a direct jump from pre-implantation to the later fetal stage, skipping the embryonic period, which is not accurate given the standard sequence of prenatal development.
Thus, evaluating the sequence of developmental periods, implantation occurs at the end of the germinal period and the beginning of the embryonic period, making option 2 the correct choice.

The implantation of the blastocyst in the uterine wall marks the transition between which two consecutive periods of prenatal development?单项选择题

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