Fertilization-The First Week Flashcards Preview

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Flashcards in Fertilization-The First Week Deck (23):
1

how many sperm will fertilize the secondary oocyte

only one!

2

the two layers that the sperm must go through are ?

corona radiata and the zona pellucida

3

what produces the zona pellucida

oocyte and the follicular cells which makes the primordial germ cell become a primary follicle

4

Zona reaction

prevents any further fertilization by the sperm

5

after the sperm fertilizes the egg what happens to the oocyte

finishes off the 2nd meiotic division!

6

What are the 3 main things fertilization results in ?

restoration of a diploid genome, determines the genetic sex of the embryo, intitiation of cleavage

7

what determines the sex of the embryo ?

whether or not the sperm is carrying an X or an Y chromosome

8

contraceptive pill

consists of estrogens and progesterone

9

depo provera

progesterone analog

10

plan B

levonorgestrel (progesterone analog)

11

RU-486

acts as an antiprogesterone

12

what happens within 24 hours of fertilization

cleavage which is a series of regulated mitotic cell divisions and there is NO growth in size at this time

13

What is compaction in reference to the morula?

cells increase surface contact with other cells, increase gap juctions to allow communication and it starts to show polarity and shift the nucleus and cytoplasm

14

morula begins to form a fluid filled space and is called what now

blastocyst

15

ectopic pregnancy

pregnancy anywhere outside of the uterus

16

placental previa

implantation in the lower part of the uterus (generally near the cervix)

17

placental abrubtion

tearing or disconnected placenta

18

placental accreta

abnormal growth of the placenta and if it invades or grows into the musculature

19

cortical reaction

when the oocyte releases all of its lysosomal contents in reaction to the penetration by the sperm

20

the maternal pronucleus is important in what

development of embryo

21

the paternal pronucleus is important in what

extraembryonic tissue

22

implantation occurs how many days after fertilization

6

23

implanataion into the uterus is associated with

dissolution of the zona pellucida, adhesion of blastocyst onto endometriu, trophoblastic penetration and spread into endometrium, and migration of blastocyst into endometrium