Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Livestock Reproduction 333 > Placentation > Flashcards

Placentation Flashcards

1
Q

What is a placenta?

A

Transient endocrine organ interchange between the conceptus and dam

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the placenta made of?

A

Fetal component derived from chorion and maternal component derived from the uterine endometrium

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the functional units of the placenta?

A

chorionic villus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How are placentas classified?

A

According to the distribution of chorionic villi and by the intamacy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How are the chronionic villi distribution classified?

A

Diffuse, Cotyledonary, Zonary, Discoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Name the species and the typeof chorionic villi distribution it has.

A 
Sow-Diffuse
Mare Diffuse
Cow- Cotyledonary
Ewe-Cotyledonary
Dog-Zonary
Human- Discoid
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is different between the mare and the sows diffuse placentas?

A

Mares has microcoteledonarys all over

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is placentome?

A

consists of a fetal cotyledon and maternal caruncle that originates in the caruncular regions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How many layers can change occur through?

A

7

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How can someone determine if we are discussing the maternal or fetal side?

A

Prefix describes maternal and suffix describes fetal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the least intimate placenta?

A

Epitheliochorial found in the mare and sow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What does the BNCG secrete?

A

Placental lactogen and protein B

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe the Diffuse villi distribution.

A

Velvet like surface, villi cover the entire surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The mare has 5-10 endometrial cups. Describe their origin and where they are distributed.

A

Trophoblastic and endometrial origin.

Distributed over the surface of the placenta

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the process of the endometrial cups?

A

Produce eCG between days 35 & 60 of pregnancy and are sloughed into the uterine lumen afterwards.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What days does the chorion initiate attachment of the caruncles to the uterus?

A

16 days in sheep

25 days in cattle

17
Q

How are discoid placentas determined?

A

One or two distinct discs on one region of the chorion

18
Q

Describe the epitheliochorial placenta.

A

Both the endometrial epithelium and the epithelium of the chorionic villi are intact. In sow and mare

19
Q

What is different about the ruminants of the epitheliochoral placenta?

A

The endometrial epithelium can erode and become a syndesmochrial

20
Q

What does BNGC make?

A

Estrogens and progesterone

21
Q

When does Binucleate giant cells appear?

A

14 days in sheep

20 days in cows

22
Q

Describe BNGC.

A

Originate from trophoblastic cells and may transfer complex molecules from the fetal to maternal complex

23
Q

What is the most intimate placenta? What species has it?

A

Hemoendotheial

Rabbit

24
Q

What purpose does the placenta serve during preganancy?

A

A Transient endocrine organ-hormones in the placenta circulate through fetal and maternal systems

25
Q

Describe the purpose of the eCG at attachment.

A

Acts as a luteotropin for CL maintenance and of the accessory CL

26
Q

eCG has a powerful FSH activity in all species except what?

A

Mare

27
Q

Where and when is hCG made?

A

Found in primates it is made by the chorion after the blastocyst hatches from the ZP

28
Q

When can hCG be detected?

A

In the blood and urine as early as 8 days

29
Q

What would happen if a mare was high with eCG during pregnancy?

A

Ovulate between day 40-70

30
Q

What is the P4 block?

A

When high levels of P4 inhibit myometrial contractions

31
Q

Which animal needs the CL and which species don’t need it the whole pregnancy?

A

Sow and Rabbit need it

Ewe, mare and women don’t need the CL

32
Q

What stimulates the growth of the fetus and mammary gland? What produces it?

A

Placental lactogen

Produced by binucleate cells

33
Q

Where does relaxin originate?

A

From the ovary and placenta at birth

34
Q

Aromatase makes androgens into what?

A

Estrogen

35
Q

What three hormones cause contractions?

A

E2, PGF2a and Oxytocin

36
Q

Fetus stress is caused by what?

A

Space limitations in the uterus

37
Q

What does fetus stress cause the fetal AP to secrete?

A

ACTH that then stimulate production of corticosteroids

38
Q

What are the layers of the placenta and which is the most and least intimate?

A

Hemoendothical- Most Intimate
Hemochorial
Endothelialchorial
Epitheliocorial- Least Intimate

39
Q

What is another name for placental lactogen and what does it do?

A

Somammatotropin- Stimulates fetus and mammary gland growth

Livestock Reproduction 333 (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions