Pregnancy and Childbirth

Question 0

The tropoblast differentiates into:

Answer 0

1) tropoblast(outer)

2) cytotropoblast(inner)

Question 1

What secretes the protease that breaks down the zona pellucida?

Answer 1

The uterus, 6 days after fertilization

Question 2

What secretes the protease that breaks down the uterine endometrium for implantation?

Answer 2

The syncytiotropoblast

Question 3

What is the Decuiduoma Response?

Answer 3

When the uterine reacts to the invasion of the blastocyst by growing over the implantation site–>marks completion of implantation

Question 4

Amnion

Answer 4

• grows over forming embryo
• amniotic cavity becomes filled with amniotic fluid
• fluid protects fetus against mechanical shock and supplies water and other material to fetus

Question 5

Allantois

Answer 5

• helps form membranes for blood vessels of umbilical chord
• resivior for moving toxic waste
• mainly a vestigial structure

Question 6

Chorion

Answer 6

• derived from the cytotrophoblast and surrounds embryo 1 month after development
• forms important component of placenta

Question 7

Pregnancy with dizygotic twins

Answer 7

• 2 zygotes formed and 2 embryos implanted into uterus
• when implanted seperately: 2 placentas, chorions, and amnions apear
• when implanted together: single placenta, fused chorions, and 2 amnions present

Question 8

Pregnancy with monozygotic twins

Answer 8

-produces two embryos with single placenta and chorion, but 2 amniotic sacs`