Quiz 4 Last year

Question 1

Apoptosis

Answer 1

programmed cell death as occurs during luteolysis

Question 2

Anestrus

Answer 2

absence of estrous cycles or a period of sexual inactivity between two breeding seasons

Question 3

Luteal phase

Answer 3

Stage of the estrous cycle when the corpus luteum is active and progesterone influence predominates

Question 4

Stigma

Answer 4

the site of follicular rupture on the Graafian follicle wall at ovulation

Question 5

Zona Pellucida

Answer 5

a thick mucoprotein coat surrounding the oocyte

Question 6

Atresia

Answer 6

Degenerative changes undergone by unruptured follicles in the ovaries

Question 7

There is a bidirectional communication between the oocyte and granulosa cells. Please describe and provide some examples of such communications

Answer 7

Gap junctions allow exchange of small molecules
example-transfer of amino acids to help development of the oocyte
Paracrine secretion
Example- granulosa cell releases growth factors and hormones needed for oocyte growth

Question 8

Diagram the two-cell, two-gonadotrophin model of estrogen production in the ovary

Question 9

How does one follicle become dominant during a follicular wave in the cow (what are the hormones involved)

Question 10

Briefly describe how the oocyte is arrested during early oogenesis and how it resumes meiosis following LH surge

Question 11

BONUS: what is the main enzyme responsible for thinning the follicular wall during ovulation and which factor activates it?