chapt. 23

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chapt. 23
2012-06-12 20:16:41
chapter 23

chapter 23
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  1. The cells of a blastocyst that give rise to the body of the developing offspring constitute the
    inner cell mass
  2. The placental membrane is composed of
    a single layer of epithelial cells
  3. The ductus venous is a fetal vessel that functions to transport blood from the umbilical vein to
    inferior vena cava
  4. The foramen ovale is an opening that allows fetal blood to pass from the
    right atrium to the left atrium
  5. The fetal blood that passes through the ductus venosus is relatively
    high in oxygen and nutrients
  6. As a result of the foramen ovale, blood is allowed to bypass the
  7. The ductus arteriosus allows fetal blood to move from the
    pulmonary trunk into the aorta
  8. Which of the following factors seems to stimulate a newborns first breath?
    all of these are correct
  9. Which of the following provides the main source of energy for a newborn during its first few days?
  10. After birth, the foramen ovale is closed as a result of
    increasing pressure in the left atrium
  11. Following birth, bradykinin is released from the newborn's lungs in response to
    constriction of the ductus venosus
  12. Which of the following is not a characteristic of childhood?
    becoming reproductively functional
  13. As a rule, during adulthood
    all of these are correct
  14. The placenta is composed of tissues from the
    mother only
  15. Which of the following is true in regard to the fetal stage of development?
    All of these are correct
  16. The symptoms of fetal alcohol syndrome include
    all of these are correct
  17. A major difference between fetal blood flow and adult blood flow is that in the fetus the
    inferior vena cava contains blood high in oxygen
  18. Which of the following adult structures is not derived from the same primary germ layer as the others
  19. The external genitalia of the fetus can be distinguished as male or female by which of the following periods after fertilization?
    about 12 weeks
  20. Which of the following combinations would be needed to cause the development of dizygotic twins?
    two egg cells and two sperm cells
  21. Most commonly, a blastocyst becomes implanted in the uterine's
    upper posterior wall
  22. The placenta synthesizes progesterone from
  23. Teratogens are substances that
    cause congenital malformations
  24. A blastomere is a __ and a blastocyst is ___
    cell produced by cleavage; a hollow ball of cells
  25. During the embryonic stage, the primary germ layers develop from the
    embryonic disk
  26. The major body parts derived from endoderm are the epithelial lining of the
    all of these are correct
  27. Amniotic fluid functions to
    protect the embryo against being jarred by movements of the mother's body
  28. The yolk sac functions to
    form blood cells in early development
  29. The term newborn refers to the period from birth through___, whereas the term infant refers to the period from ___
    the first four weeks; the first month to a year
  30. Conception normally occurs
    in the uterine tube
  31. The sideways movement of sperm tails as well as muscle contractions within the walls of the uterus are stimulated by
  32. ___ is the process of preparing the sperm for penetration of the oocyte
  33. One of the enzymes secreted by sperm which is important for penetration is
  34. Which of the following layers is considered loosely organized connective tissue?
  35. Labor is regulated by
    positive feedback control
  36. The fetus is protected from certain
    antibodies from the mother's immune system