BI 232: Pregnancy and Human Development - Review
Questions 2026 Guide
1. What obstacles do After ejaculation, sperm must pass through the length vagina and its acidic
sperm encounter on environment. When they enter the uterus, strong uterine contractions and
their way to the local phagocytes destroy the sperm.
oocyte?
2. Two mechanisms oocyte membrane block, cortical reaction
and pre-
vent polyspermy in
humans.
3. Arrange the stages of c, d, b, e, a
the conceptus in or-
der from fertilization
to birth.
a) Fetus
b) Blastocyst
c) Zygote
d) Morula
e) Embryo
4. Implantation occurs six; seven
to days after
fertilization.
5. During trophoblast cytotrophoblast and syncytiotrophoblast
proliferation, two lay-
ers are formed:
and .
6. What is the role of the The syncytiotrophoblast is a multinucleated mass of cells that extends pro-
syncytiotrophoblast? trusions into the uterine lining, where it secretes enzymes to digest the
uterine wall and facilitate the implantation of the embryo.
1/7
, BI 232: Pregnancy and Human Development - Review
Questions 2026 Guide
7. How does the embryo The syncytiotrophoblast secretes human chorionic gonadotropin (hCG),
save the corpus lu- which acts like LH to stimulate the secretion of estrogen and progesterone,
teum and the embryo and also maintains the corpus luteum. In addition, hCG prevents the moth-
itself? er's immune system from attacking the newly formed embryo, thereby
preventing spontaneous abortion.
8. Between the second placenta
and third month, the
corpus luteum is re-
placed by , which
takes over the pro-
duction of estrogen
and progesterone.
9. Decidua is divided basalis, capsularis
into decidua and
decidua .
10. The amnion develops a) Epiblast
from:
a) Epiblast
b) Hypoblast
c) Gastrula
d) Endoderm
11. What are the func- The yolk sac forms the digestive tube of the embryo and is the source of
tions of the yolk sac in early blood cells and primordial germ cells.
humans?
12. The basis for the for- allantois
mation of the umbili-
cal cord is .
2/7
Questions 2026 Guide
1. What obstacles do After ejaculation, sperm must pass through the length vagina and its acidic
sperm encounter on environment. When they enter the uterus, strong uterine contractions and
their way to the local phagocytes destroy the sperm.
oocyte?
2. Two mechanisms oocyte membrane block, cortical reaction
and pre-
vent polyspermy in
humans.
3. Arrange the stages of c, d, b, e, a
the conceptus in or-
der from fertilization
to birth.
a) Fetus
b) Blastocyst
c) Zygote
d) Morula
e) Embryo
4. Implantation occurs six; seven
to days after
fertilization.
5. During trophoblast cytotrophoblast and syncytiotrophoblast
proliferation, two lay-
ers are formed:
and .
6. What is the role of the The syncytiotrophoblast is a multinucleated mass of cells that extends pro-
syncytiotrophoblast? trusions into the uterine lining, where it secretes enzymes to digest the
uterine wall and facilitate the implantation of the embryo.
1/7
, BI 232: Pregnancy and Human Development - Review
Questions 2026 Guide
7. How does the embryo The syncytiotrophoblast secretes human chorionic gonadotropin (hCG),
save the corpus lu- which acts like LH to stimulate the secretion of estrogen and progesterone,
teum and the embryo and also maintains the corpus luteum. In addition, hCG prevents the moth-
itself? er's immune system from attacking the newly formed embryo, thereby
preventing spontaneous abortion.
8. Between the second placenta
and third month, the
corpus luteum is re-
placed by , which
takes over the pro-
duction of estrogen
and progesterone.
9. Decidua is divided basalis, capsularis
into decidua and
decidua .
10. The amnion develops a) Epiblast
from:
a) Epiblast
b) Hypoblast
c) Gastrula
d) Endoderm
11. What are the func- The yolk sac forms the digestive tube of the embryo and is the source of
tions of the yolk sac in early blood cells and primordial germ cells.
humans?
12. The basis for the for- allantois
mation of the umbili-
cal cord is .
2/7
