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Stages of human embryonic development leading to implantation in the uterus.

Diagram showing the stages of early human embryonic development from fertilization to blastocyst implantation in the uterus, including the unfertilized oocyte, fertilized oocyte, two-cell stage, four-cell stage, eight-cell stage, morula, and blastocyst with trophoblast and inner cell mass.

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Show Answer Key & Explanations Step-by-step solution for: Embryonic Development | Anatomy and Physiology II

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1. Unfertilized Oocyte
2. Fertilized Oocyte
3. Two-cell stage
4. Four-cell stage
5. Eight-cell stage
6. Morula (16 cells)
7. Blastocyst (70–100 cells)
8. Embryo hatches (sheds zona pellucida)
9. Blastocyst rotates and implants into endometrium of the uterus

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