Chapter 7 Lecture 15? Flashcards
Which condition is related to paternal imprinting?
A. Accessory placental lobes
B. Placenta Previn
C. Oligohydramnios
D. Single umbilical artery
E. Hydatidiform mole
E. Hydatidiform mole
Blood vessels associated with which structure enter the fetal component of the placenta?
A. Decidua basalis
B. Allantois
C. Amnion
D. Yolk sac
E. Deciduous parietalis
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. Synctiotrophoblast
C. Fetal erythrocytes
D. Cytotrophoblast
E. Amniotic epithelium
D. Cytotrophoblast
Which condition 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 year old 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 hemochromatosis type of placenta?
Because the placental villi (specializations of the chorion) are directly bathed in maternal blood.
Through what layers of a placental villus must a molecule of oxygen pass to go from the maternal blood into the embryonic circulation?
Early fetus - synctiotrophoblast, cytotrophoblast, basal lamina, underlying cytotrophoblast, villous mesenchyme, basal lamina of a fetal capillary, endothelium of fetal capillary.
Mature placenta - synctiotrophoblast, a fused basal lamina of trophoblast and capillary endothelium, and the endothelium of fetal capillary
What embryonic hormone has served as the basis for many standard pregnancy tests and why?
HCG - first distinctive embryonic hormone to be produced by the tophoblastic tissues
Why must a pregnant woman be very careful of what she eats and drinks?
Many substances that enter a woman’s blood are known to cross the placental barrier, including alcohol, many drugs (prescribed and illicit), steroid hormones and other low molecular-weight substances. Generally, molecules with molecular weights less than 5000 daltons should be assumed to cross the placental barrier with little difficulty.
In the mature placenta, which fetal tissue directly interfaces with the maternal uterine connective tissue?
A. Cytotrophoblast
Synctiotrophoblast
C. Extraembryonic mesoderm
D. Decidual cells
E. None of the above
A. Cytotrophoblast
