17-22 Questions

Question 1

Which condition is related to paternal imprinting?

Answer 1

Hydatiform mole

Question 2

Blood vessels associated w/ which structure enter the fetal component of the placenta?

Answer 2

Allantois

Question 3

What type of cells invades the maternal spiral arteries and reduces the flow of blood from their open ends?

Answer 3

Cytotrophoblast

Question 4

Which condition of the extraembryonic membranes can be found in uteri containing identical twins?

Answer 4

Common placenta and amniotic membrane; common placenta and chorion, separate amnions; separate placentas and extraembryonic membranes; common placenta, partially fused chorion a

Question 5

A 28 year old Rh negative woman’s second son is born severely jaundiced. Which characteristic most likely describes her first child?

Answer 5

Rh positive

Question 6

Why is the human placenta designated a hemochorial type of placenta?

Answer 6

B/c the placental villi are directly bathed in maternal blood.

Question 7

Through what layers of a placental villus must a molecule of O2 pass to go from the maternal blood into the embryonic circulation?

Answer 7

Early fetus: syncytiotrophoblast, Cytotrophoblast, basal lamina underlying Cytotrophoblast, villous mesenchyme, basal lamina of fetal capillary, endothelium of the fetal capillary.
Mature placenta: syncytiotrophoblast, fused basal lamina of trophoblast and capillary endothelium, endothelium of a fetal capillary.

Question 8

In the mature placenta, which fetal tissue directly interfaces with the maternal uterine CT?

Answer 8

Cytotrophoblast