Placentation 1 (Ch. 14) Flashcards Preview

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Flashcards in Placentation 1 (Ch. 14) Deck (16):
1

(T/F) The placenta will suppress fetal cortisol exposure
What is fetal cortisol?

True!
A stress hormone

2

What are four things that are NOT transported through the placenta?

1. Large peptide hormones
2. Lipids
3. Immunoglobulins
4. Proteins

3

(T/F) Drugs, toxins, and viruses can be transported through the placenta

True!

4

Fluids aid in expansion of placental membranes to achieve what?

Maximal opposition between maternal and fetal systems for exchange via increased surface area

5

Fluid changes are influenced by what?

Hormones

6

There is a # correlation between fetal weight and placental weight

0.8-0.9

7

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

8

Which species of animal(s) have the highest amount of uterine blood flow?

Horses and pigs

9

Which placental TYPE is considered the least intimate?
Which species has these?

Epitheliochorial

10

The Binucleate giant cells will fuse to the ___ membrane in what species?

Basement membrane
Ruminants

11

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

12

Equine chorionic gonadatropin (eCG) is produced by what structure in the placenta?

Endometrial cups

13

(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

14

What hormone will see a spike in production when parturition nears?
What hormone is this converted from and by what enzyme?

Estradiol
Progesterone
Aromatase

15

Briefly describe the 3 stages of parturition

1. initiation of myometrial contractions (removal of progesterone block)
2. expulsion of fetus
3. expulsion of the fetal membranes

16

What lobe is oxytocin secreted from?
What does oxytocin do for parturition?

Posterior lobe
Stimulates contraction of myometrium