First week of development

Question 1

At ovulation, granulosa cells do what?

Answer 1

Some stay with the oocyte and form the corona radiata and some stay in the ovary and form the corpus luteum to secrete progesterone

Question 2

where does fertilization occur?

Answer 2

In the ampulla of the uterine tube

Question 3

What must happen to spermatozoa before they can fertilize an oocyte?

Answer 3

capicitation (removal of glycoprotein coat and seminal plasma proteins)

Question 4

What are the three phases of fertilization?

Answer 4

penetration of the corona radiata
penetration of the zona pellucida
Fusion of the oocyte and spermatozoa membranes

Question 5

What does the head and tail of the spermatozoan entering the cytoplasm of the oocyte trigger?

Answer 5

resumption of the 2nd meiotic division
arrangement of male and female pronucleus
replication of pronucleus to restore diploid number

Question 6

What are the cells of the zygote called?

Answer 6

blastomeres

Question 7

What happens to the blastomeres at the 8 cell stage?

Answer 7

form tight junctions and the inner and outer cells separate

Question 8

What happens when spermatozoa contact the oocyte PM?

Answer 8

Oocyte releases enzymes that alter the PM so no more sperm can enter

Question 9

What happens at the 16 cell morula stage?

Answer 9

The inner and outer cell masses form

It enters the uterine cavity and fluid fills the inner cell mass forming the blastocele

Question 10

What is a blastocyst?

Answer 10

The stage of the embryo after the formation fo teh blastocele; the outer cell mass= trophoblast, inner cell mass= embryoblast and zona pellucida is gone