Quiz 9

Question 1

What is the function for the gap junctions in the morula and blastocyst embryos?

Answer 1

intercellular communication

Question 2

What is the function for the tight junctions in the morula and blastocyst embryos?

Answer 2

permeability: allows for fluid to accumulate within the cell

Question 3

Name the four extra embryonic membranes and explain the main function of each.

Answer 3

yolk sac - gives rise to primordial germ cells
chorion - gives rise to the placenta
amnion - protective sac
allantois - poop shoot (waste house)

Question 4

Which membrane(s) is given rise from embryonic trophoblast cells?

Answer 4

chorion

amnion

Question 5

Which membrane regressed and shrinks later during the embryonic development?

Answer 5

yolk sac

Question 6

True or False
If an embryonic signal is delivered quick enough and on timely manner, luteolysis will occur, progesterone will decline, and the early embryo will die.

Answer 6

False

Question 7

True or False

In the pigs, estradiol reroutes PGF2alpha secretion to the lumen of the uterus.

Answer 7

True

Question 8

True or False

Chorion cells of the embryo are responsible for secretion interferon-tau in cattle.

Answer 8

False

Question 9

True or False

In mares the conceptus migrate within the uterus between 12 to 14 times per day.

Answer 9

True

Question 10

Which cell type from the embryo gives rise to the Chorion?

Answer 10

mesoderm

trophoblasts

Question 11

Length of gestation in Cow.

Answer 11

283

Question 12

Length of gestation in Sow.

Answer 12

114

Question 13

Length of gestation in Mare.

Answer 13

340

Question 14

Pregnancy recognition factor for Ewe.

Answer 14

Ovine Interferon-tau

Question 15

Pregnancy recognition factor for Cow.

Answer 15

Bovine Interferon-tau

Question 16

Pregnancy recognition factor for Sow.

Answer 16

Estrogen

Question 17

Pregnancy recognition factor for Mare.

Answer 17

Small unknown peptide

Question 18

True or False
Maternal recognition of pregnancy must occur at the same time as the first oxytocin and PGF2alpha pulls during luteolysis

Answer 18

False

Question 19

True or False
For the early embryo to become an established pregnancy, luteolysis must be prevented and progesterone must be maintained.

Answer 19

True

Question 20

True or False
During maternal recognition in the sow; in the presence of two embryo, estradiol reroutes PGF2alpha secretion away from the CL in the uterine lumen.

Answer 20

True

Question 21

True or False

The conceptus endoderm cells provide maternal recognition signals to prevent luteolysis and maintain pregnancy.

Answer 21

False

Question 22

True or False
Cells in the inner portion of the morula develop gap junctions, whereas the outer cells of the morula develop tight junctions.

Answer 22

True

Question 23

True or False
A fetus is defined as a potential offspring that is in the uterus, but generally cannot be recognized as a member of a species.

Answer 23

False

Question 24

True or False

Blastomeres from the 2-4 cells embryo is also called totipotent

Answer 24

True

Question 25

In cattle the specific maternal recognition factors called _____ is secreted from the _____ cells of the embryo. This protein is secreted around days _____ after fertilization. This protein stops the secretion and synthesis of luteolytic hormone _____ by blocking the synthesis of _____ receptors.

Answer 25

``` Bovine interferon-tau trophoblast 13-15 PGF2alpha Oxytocin ```

Question 26

The main embryonic germ layer that contributed to allantois is mesoderm, whereas embryonic germ layers called _____ and _____ give rise to chorion.

Answer 26

trophoblast | mesoderm

Question 27

When a distinct cavity is recognizable within the embryo, the embryo is called _____. At this stage, the embryo is partitioned into two distinct cellular populations known as the _____ and the _____.

Answer 27

ICM (intercellular mass) | trophoblast