In the blastocyst, the
a. trophoblast is destined to become the fetus.
b. trophoblast is destined to become the fetal portion of the placenta.
c. trophoblast is destined to become the inner cell mass.
d. blastocoele serves the functions of the digestive system, lungs, and kidneys for the fetus.
e. blastocoele is destined to become the fetus.
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Question 2) Which of the following statements concerning implantation is correct?
a. Implantation is accomplished by enzymatic activity of the trophoblastic layer of the blastocyst.
b. The endometrium at the site of implantation is converted into the nutrient-rich decidua.
c. Implantation occurs within 24 hours after fertilization.
d. Both (a) and (b) above are correct.
e. All of these answers are correct.
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Question 3) Implantation normally occurs
a. in the oviduct.
b. about 3 days after fertilization.
c. during the secretory, or progestational, phase.
d. both (b) and (c) above.
e. all of these answers.
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Question 4) During the follicular phase, the ovary secretes ____ levels of estrogen and ____ levels of progesterone.
a. high, high
b. high, low
c. low, high
d. low, low
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Question 5) During the secretory phase, the corpus luteum secretes ____ levels of estrogen and ____ levels of progesterone.
a. high, high
b. high, low
c. low, high
d. low, low
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Question 6) Implantation
a. is accomplished as the trophoblastic cells break down the endometrial tissue.
b. occurs during the secretory, or progestational, phase of the menstrual cycle.
c. occurs within 24 hours after ovulation.
d. both (a) and (b) above.
e. all of these answers.
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Question 7) A chemical change in which structure prevents polyspermy fertilization?
a. sperm
b. acrosome
c. ovaries
d. zona pellucida
e. corpus luteum
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Question 8) Fertilization is characterized by
a. a sperm's fertilin proteins binding to the ovum's integrin molecules.
b. a block to polyspermy.
c. multiple sperms penetrating the ovum.
d. blastocyst formation.
e. both (a) and (b) above.
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Question 9) During fertilization, sperm bind to specific receptor sites on the surface of the
a. zona pellucida.
b. corona radiata.
c. plasma membrane of the ovum.
d. polar body.
e. oviduct.
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Question 10) The normal site of implantation is the
a. ovary.
b. uterus.
c. oviduct.
d. vagina.
e. fimbria.
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