Placentation 1 (Ch. 14) Flashcards
(T/F) The placenta will suppress fetal cortisol exposure
What is fetal cortisol?
True!
A stress hormone
What are four things that are NOT transported through the placenta?
- Large peptide hormones
- Lipids
- Immunoglobulins
- Proteins
(T/F) Drugs, toxins, and viruses can be transported through the placenta
True!
Fluids aid in expansion of placental membranes to achieve what?
Maximal opposition between maternal and fetal systems for exchange via increased surface area
Fluid changes are influenced by what?
Hormones
There is a # correlation between fetal weight and placental weight
0.8-0.9
Describe the relationship between placental weight and fetal weight
The placental weight is the first thing to grow
Then as the fetus begins to function on its own the placental weight (liquid) will decrease, while fetal weight increases
Which species of animal(s) have the highest amount of uterine blood flow?
Horses and pigs
Which placental TYPE is considered the least intimate?
Which species has these?
Epitheliochorial
The Binucleate giant cells will fuse to the ___ membrane in what species?
Basement membrane
Ruminants
What is the name for the button like structures present during a ruminants pregnancy?
What are the two types?
When it joins the maternal caruncle it becomes what?
Fetal cotyledons
Convex (cow, giraffe)
Concave (sheep, goat)
Placentome
Equine chorionic gonadatropin (eCG) is produced by what structure in the placenta?
Endometrial cups
(T/F) The mare’s CL can produce enough progesterone through the duration of pregnancy
False!
Needs help from accessory CL, which is produced and maintained by eCG
What hormone will see a spike in production when parturition nears?
What hormone is this converted from and by what enzyme?
Estradiol
Progesterone
Aromatase
Briefly describe the 3 stages of parturition
- initiation of myometrial contractions (removal of progesterone block)
- expulsion of fetus
- expulsion of the fetal membranes
