At what time in the pregnancy is the placenta fully prepared to fulfill the needs of the developing fetus?
What will be an ideal response
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Question 2) A friend confides that she desires to have children but is having trouble conceiving. Which of the following is true regarding implantation?
A) An estimated 60 of implanted embryos later miscarry due to genetic defects of the embryo.
B) Detection of human chorionic gonadotropin (hCG) in blood or urine indicates failure of the blastocyst to implant.
C) It is estimated that a minimum of two-thirds of all zygotes formed fail to implant by the end of the first week or spontaneously abort.
D) In cases where implantation fails to occur, a nonreceptive uterus becomes receptive once again.
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Question 3) Cells of the ________ gather around the notochord and neural tube and produce the vertebra and rib at their associated level.
A) myotome
B) intermediate mesoderm
C) dermatome
D) sclerotome
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Question 4) Neural tissue develops from the ________.
A) endoderm
B) mesoderm
C) ectoderm
D) entoderm
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Question 5) In the block to polyspermy, entry of the sperm's contents causes ________ levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.
A) calcium ion
B) ATP
C) phosphate ion
D) sodium ion
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Question 6) Which of the following refers to the transfer of sperm and harvested oocytes together into the woman's uterine tubes in the hopes that fertilization will take place there?
A) in vitro fertilization (IVF)
B) zygote intrafallopian transfer (ZIFT)
C) rhythm method
D) gamete intrafallopian transfer (GIFT)
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Question 7) As the infant's head is forced against the cervix with each contraction, the cervix effaces, which means that it ________.
A) crowns
B) dilates
C) softens
D) thins
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Question 8) As pregnancy continues, the increasing bulkiness of the anterior abdomen changes the woman's center of gravity, possibly causing an accentuated lumbar curvature called ________.
A) scoliosis
B) hunchback
C) lordosis
D) kyphosis
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Question 9) The first major event in organogenesis is ________.
A) myelination
B) gastrulation
C) ossification
D) neurulation
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Question 10) Which of the following is NOT usually considered a teratogen?
A) German measles
B) nicotine
C) aspirin
D) wine
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