Problems to Solve

1. The second week of development is known as the week of twos. Formation of what structures support this statement?

2. During implantation, the trophoblast is invading maternal tissues, and because it contains approximately 50% paternal genes, it is a foreign body. Why is the conceptus not rejected by an immunologic response from the mother's system?

3. A woman who believes she is pregnant complains of edema and vaginal bleeding. Examination reveals high plasma hCG concentrations and placental tissue, but no evidence of an embryo. How would you explain this condition?

4. A young woman who has missed two menstrual periods complains of intense abdominal pain. What might an initial diagnosis be, and how would you confirm it?

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