Early Embryogenesis 2 (Ch. 13) Flashcards Preview

Reproduction Exam 4 > Early Embryogenesis 2 (Ch. 13) > Flashcards

Flashcards in Early Embryogenesis 2 (Ch. 13) Deck (19):
1

Gametes develop in the ___

Yolk sac

2

Two sacks will form in the embryo, what are they called and what are their functions?

Amnion: allows for fetal symmetry
Allantois: recycles nutrients for fetal growth

3

What hormone initiates secretions that are necessary for pregnancy?

Progesterone (P4)

4

All livestock, except ___, will encounter the elongation process

Horses

5

What significant event happens during the elongation process of the embryo in ruminants?

Interferon tau is produced, which informs the mother of pregnancy

6

Prostaglandin is pulsed in the presence of ___ (hormone)

Oxytocin

7

(T/F) Oxytocin is still released during pregnancy

True!

8

During pregnancy the oxytocin receptors are blocked by ___ in what species?

Interferon tau (INF-t)
Ewe and cow

9

What kind of cells produce IFN-t?

Mononuclear cells

10

(T/F) All animals produce INF-t

False!
Only ruminants produce this

11

Maternal recognition of pregnancy must occur prior to ___

Luteolysis

12

Describe how INF-t works

It is secreted by the trophoblast cells and decreases endometrial oxytocin receptors
This prevents PGF2-alpha synthesis and stops luteolysis

13

What is the conceptus?

It is the embryo and its adjunct parts

14

What happens in the sow that prevents luteolysis?

Estradiol reroutes PGF2-alpha

15

When a sow is pregnant the PGF2-alpha will be secreted (endocrine/exocrine)

Exocrine

16

(T/F) The faster an embryo elongates, the more nutrients it will be exposed to

True!

17

When is STAT-1 released?

When a placenta is present

18

(T/F) If an oocyte is not fertilized in a mare it will migrate out of the oviduct

False!
It will stay in the oviduct

19

Briefly describe what each one does:
1. yolk sac
2. chorion
3. amnion
4. allantois

1. provides nutrients
2. will attach to placenta
3. provides a protective sac for fetus
4. collects liquid waste from embryo