The outer layer of the blastocyst, the trophoblast, will develop into the
a) chorion, which will form the placenta
b) placenta, which will form the chorion
c) germ layers, which provide immunity for the developing embryo
d) germ layers, which will arise into the various systems of the human body
After successful implantation, the trophoblast of the blastocyst starts to secrete
a) hGh
b) LH
c) hCG
d) PRL
Human chorionic gonadotropin (hCG) is initially secreted by the______ and has its highest concentration during the ________ trimester
a) placenta; third
b) trophoblast; third
c) trophoblast; first
d) placenta; first
During pregnancy, progesterone is secreted initially by the corpus luteum and later by the placenta. Progesterone levels
a) continue to increase until progesterone stabilizes near the end of pregnancy
b) are depleted greatly all through pregnancy because progesterone is not required
c) decline after the corpus luteum disintegrates and will function no more
d) are high during the first trimester and gradually fall until the end of pregnancy
The process that forms the neural tube and leads eventually to the development of the brain and spinal cord is called
a) morphogenesis
b) neurulation
c) gastrulation
d) nondisjunction
The human embryo has a distinct human form first at
a) 15 to 20 days; 3rd and 4th weeks
b) 50 to 65 days; 7th and 8th weeks
c) second trimester
d) third trimester
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