Chapter 7 Questions Flashcards
(10 cards)
In the mature placenta, which fetal tissue directly interfaces with the maternal uterine connective tissue? A. Cytotrophoblast B. Syncytiotrophoblast C. Extraembryonic mesoderm D. Decidual cells E. None of the above
A. Cytotrophoblast
Which condition is related to paternal imprinting? A. Accessory placental lobes B. Placenta previa C. Oligohydramnios D. Single umbilical artery E. Hydatidiform mole
E. Hydatidiform mole
Blood vessels associated with which structure enter thee fetal component of the placenta? A. Decidua basalis B. Allantois C. Amnion D. Yolk sac E. Decidua parientalis
B. Allantois
What type of cells invades the maternal spiral arteries and reduces the flow of blood from their open ends? A. Hofbauer cells B. Syncytiotrophoblast C. Fetal erythrocytes D. Cytotrophoblast E. Amniotic epithelium
D. Cytotrophoblast
Which conditions of the extraembryonic membranes can be found in uteri containing identical twins?
A. Common placenta and amniotic membrane
B. Common placenta and chorion, separate amnions
C. Separate placentas and extraembryonic membranes
D. Common placenta, partially fused chorions
E. All of the above
E. All of the above
A 28 y.o. Rh-negative woman's second son is born severely jaundiced. Which characteristic most likely describes her first child? A. Male B. Female C. Rh positive D. Rh negative E. Hydramnios
C. Rh positive
Why is the human placenta designated a hemochorial type of placenta?
Because the placenta villi are directly bathed in maternal blood.
What hormone has served as the basis for many standard pregnancy tests? Why?
HCG because it is the first distinctive embryonic hormone to be produced by the trophoblastic tissues
Why must a pregnant woman be very careful of what she eats and drinks?
Because many substances that enter a woman’s blood are known to cross the placental barrier.
Generally, molecules with molecular weights less than 5000 Daltons should be assumed to cross the placental barrier with little difficulty.
A 32 y.o woman's obstetrician notes that her weight gain during late pregnancy is excessive. At least part of her weight gain seems to be the result of a greater than normal volume of amniotic fluid. The patient lives in a remote rural area far from an imaging center. Amniocentesis is performed, and the laboratory report indicates the presence of a high level of a-fetoprotein in the amniotic fluid. The obstetrician is concerned that this pregnancy will not result in a normal single birth. What condition does the obstetrician suspect and why? A. Esophageal atresia B. Renal agenesis C. Triplets D. Anencephaly E. Placenta previa
D. Anencephaly
