A human embryo implants in the prepared endometrium during the luteal phase. Com

Question

A human embryo implants in the prepared endometrium during the luteal phase. Complete the sequence of events that occur after implantation (complete the sentence 'blanks' ---). Focus on the hormonal changes that take place. On a graph, plot the time courses of changes in the plasma leels of hCG, Estrogen, & Progesterone during a human pregnancy (be sure to label the curves).

A. The chorion is derived from ________ and produces ________

B. hCG acts on __________ to ___________________

C. The Corpus Luteum secretes _________ until ______________ takes over & secretes P/E throughout _________________

D. The ______________ degenerates

Explanation / Answer

Choraion derives from outer fold on surface of yolk sac.i.e,trophoblastic ectiderm and extra embryonic mesoderm

It priduces hcg

Hcg acts on fetus to promote growth and differentiation of fetal organ

Corpus luteum secrtes progesterone in early pregnacy until placenta takes over and secrets p/E Throught pregnancy

D.the corpus luteum degenerates.

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