ch29
Student: ___________________________________________________________________________
1. Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.
True False
2. The slow block refers to the mechanism that prevents fertilization of another egg when one is already
pregnant.
True False
3. The fertilization membrane is the endometrial tissue that receives the conceptus.
True False
4. Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.
True False
5. During implantation, the embryoblast undergoes gastrulation.
True False
6. The embryonic stage extends from 16 days through the end of week 8.
True False
7. The chorion forms the fetal part of the placenta.
True False
8. The placenta begins to form after week 8.
True False
,9. Trophoblastic nutrition refers to the nutrition of the conceptus before it implants.
True False
10. Neonatal immunity depends on IgG and IgA acquired through the placenta and colostrum, respectively.
True False
11. The heat loss of the neonate is compensated for to some extent by the thermal insulation provided by brown
fat.
True False
12. Premature infants suffer especially from multiple dysfunctions resulting from inadequate liver function.
True False
13. Teratogens usually do not cause congenital anomalies.
True False
14. Senescence begins at different ages and progresses at different rates in different organ systems.
True False
15. Life expectancy has steadily increased in the last century, whereas life span has not.
True False
16. Which of these lists the stages or structures of prenatal development in the correct order?
A. cleavage, zygote, morula, blastocyst, embryo, fetus
B. zygote, morula, blastocyst, cleavage, embryo, fetus
C. zygote, cleavage, morula, blastocyst, embryo, fetus
D. zygote, embryo, morula, blastocyst, cleavage, fetus
E. embryo, zygote, blastocyst, cleavage, morula, fetus
,17. The process that makes it possible for sperm to penetrate the egg is called
A. sperm migration.
B. capacitation.
C. the cortical reaction.
D. morulation.
E. cleavage.
18. In the slow block to polyspermy, sperm penetration releases an inflow of ___________, which in turn
stimulates the ________.
A. Cl-; corona radiata
B. K+; zona pellucida
C. Na+; fertilization membrane
D. Ca2+; fertilization membrane
E. Ca2+; cortical reaction
19. In the fast block to polyspermy, binding of sperm opens up _________ channels, which depolarizes the egg
membrane and _________.
A. Na+; prevents the entrance of any more sperm
B. Na+; prevents the entrance of more Na+
C. Na+; prevents the entrance of Ca2+
D. Ca2+; prevents the entrance of any more sperm
E. Ca2+; prevents the entrance of more Na+
20. Which of the following events happens first?
A. formation of a fertilization membrane
B. the fast block to polyspermy
C. the slow block to polyspermy
D. the cortical reaction
E. the acrosomal reaction
21. The optimal "window of opportunity" to conceive a child is
A. a few days before ovulation to less than a day after.
B. less than a day before ovulation to less than a day after.
C. a few days before ovulation to a few days after.
D. a few days before ovulation.
E. a few days after ovulation.
, 22. The spheroidal stage of early prenatal development with about 16 to 64 cells is called a/an
A. zygote.
B. embryo.
C. blastomere.
D. morula.
E. blastocyst.
23. Twins produced when a single egg is fertilized are called _____________ twins, and twins produced from
two eggs ovulated at the same time are called ___________ twins.
A. monozygotic; identical
B. dizygotic; nonidentical
C. monozygotic; dizygotic
D. dizygotic; monozygotic
E. nonidentical; identical
24. In the blastocyst, the trophoblast will become ____________, whereas the embryoblast will become
___________.
A. part of the placenta; the yolk sac
B. part of the placenta; the embryo
C. the embryo; part of the placenta
D. the embryo; the yolk sac
E. the yolk sac; the embryo
25. Primary germ layers are formed during
A. implantation.
B. cleavage.
C. conception.
D. organogenesis.
E. gastrulation.
26. Mesenchyme gives rise to
A. nervous tissue.
B. muscle, bone, and blood.
C. digestive organs and endocrine glands.
D. reproductive and urinary systems.
E. the integumentary system and exocrine glands.
Student: ___________________________________________________________________________
1. Sperm must travel to the distal end of the uterine tube to encounter the egg before it dies.
True False
2. The slow block refers to the mechanism that prevents fertilization of another egg when one is already
pregnant.
True False
3. The fertilization membrane is the endometrial tissue that receives the conceptus.
True False
4. Cleavage results in daughter cells containing half the number of chromosomes of the parent cell.
True False
5. During implantation, the embryoblast undergoes gastrulation.
True False
6. The embryonic stage extends from 16 days through the end of week 8.
True False
7. The chorion forms the fetal part of the placenta.
True False
8. The placenta begins to form after week 8.
True False
,9. Trophoblastic nutrition refers to the nutrition of the conceptus before it implants.
True False
10. Neonatal immunity depends on IgG and IgA acquired through the placenta and colostrum, respectively.
True False
11. The heat loss of the neonate is compensated for to some extent by the thermal insulation provided by brown
fat.
True False
12. Premature infants suffer especially from multiple dysfunctions resulting from inadequate liver function.
True False
13. Teratogens usually do not cause congenital anomalies.
True False
14. Senescence begins at different ages and progresses at different rates in different organ systems.
True False
15. Life expectancy has steadily increased in the last century, whereas life span has not.
True False
16. Which of these lists the stages or structures of prenatal development in the correct order?
A. cleavage, zygote, morula, blastocyst, embryo, fetus
B. zygote, morula, blastocyst, cleavage, embryo, fetus
C. zygote, cleavage, morula, blastocyst, embryo, fetus
D. zygote, embryo, morula, blastocyst, cleavage, fetus
E. embryo, zygote, blastocyst, cleavage, morula, fetus
,17. The process that makes it possible for sperm to penetrate the egg is called
A. sperm migration.
B. capacitation.
C. the cortical reaction.
D. morulation.
E. cleavage.
18. In the slow block to polyspermy, sperm penetration releases an inflow of ___________, which in turn
stimulates the ________.
A. Cl-; corona radiata
B. K+; zona pellucida
C. Na+; fertilization membrane
D. Ca2+; fertilization membrane
E. Ca2+; cortical reaction
19. In the fast block to polyspermy, binding of sperm opens up _________ channels, which depolarizes the egg
membrane and _________.
A. Na+; prevents the entrance of any more sperm
B. Na+; prevents the entrance of more Na+
C. Na+; prevents the entrance of Ca2+
D. Ca2+; prevents the entrance of any more sperm
E. Ca2+; prevents the entrance of more Na+
20. Which of the following events happens first?
A. formation of a fertilization membrane
B. the fast block to polyspermy
C. the slow block to polyspermy
D. the cortical reaction
E. the acrosomal reaction
21. The optimal "window of opportunity" to conceive a child is
A. a few days before ovulation to less than a day after.
B. less than a day before ovulation to less than a day after.
C. a few days before ovulation to a few days after.
D. a few days before ovulation.
E. a few days after ovulation.
, 22. The spheroidal stage of early prenatal development with about 16 to 64 cells is called a/an
A. zygote.
B. embryo.
C. blastomere.
D. morula.
E. blastocyst.
23. Twins produced when a single egg is fertilized are called _____________ twins, and twins produced from
two eggs ovulated at the same time are called ___________ twins.
A. monozygotic; identical
B. dizygotic; nonidentical
C. monozygotic; dizygotic
D. dizygotic; monozygotic
E. nonidentical; identical
24. In the blastocyst, the trophoblast will become ____________, whereas the embryoblast will become
___________.
A. part of the placenta; the yolk sac
B. part of the placenta; the embryo
C. the embryo; part of the placenta
D. the embryo; the yolk sac
E. the yolk sac; the embryo
25. Primary germ layers are formed during
A. implantation.
B. cleavage.
C. conception.
D. organogenesis.
E. gastrulation.
26. Mesenchyme gives rise to
A. nervous tissue.
B. muscle, bone, and blood.
C. digestive organs and endocrine glands.
D. reproductive and urinary systems.
E. the integumentary system and exocrine glands.
