Quiz 5

Question 1

Length of Estrous cycle in cattle.

Answer 1

21 days

Question 2

Duration of Estrus (heat) in cattle.

Answer 2

15 hrs

Question 3

Length of Estrous cycle in sheep.

Answer 3

17 days

Question 4

Duration of Estrus (heat) in sheep.

Answer 4

30 hrs

Question 5

Length of Estrous cycle in pig.

Answer 5

21 days

Question 6

Duration of Estrus (heat) in pig.

Answer 6

50 hrs

Question 7

Length of Estrous cycle in horse.

Answer 7

21 days

Question 8

Duration of Estrus (heat) in horse.

Answer 8

7 days

Question 9

Name the hormone responsible got the CL regression.

Answer 9

PGF2alpha

Question 10

Where is PGF2alpha synthesized?

Answer 10

Tunica mucosa in the uterus

Question 11

What stage of estrous cycle can we find a high amount of PGF2alpha concentration in the blood?

Answer 11

End of luteal phase

Question 12

_____ is the longest stage of the estrous cycle.

Answer 12

Diestrus

Question 13

_____ is dominated by a corpus luteum and high progesterone.

Answer 13

Diestrus

Question 14

_____ is the period characterized by peak estrogen and FSH concentrations.

Answer 14

Estrus

Question 15

What stages are part of the luteal phase?

Answer 15

Diestrus

Metestrus

Question 16

What stages are part of the follicular phase?

Answer 16

Proestrus

Estrus

Question 17

True or False

During the diestrus stage the dominant ovarian structure is the CL and dominant steroid hormones is progesterone.

Answer 17

True

Question 18

True or False

The predominate steroid hormone during the follicular phase of the estrous cycle is progesterone.

Answer 18

False

Question 19

True or False

During the late follicular phase, the surge of estrogen must occur before LH surge in order for ovulation to occur.

Answer 19

True

Question 20

True or False

Luteolysis occurs at the end of metestrus stage and prostaglandin F2alpha is responsible for this event.

Answer 20

False

Question 21

In animals such as _____ that exhibit estrus all the time are called _____ whereas the animals such as _____ that show estrus only during certain time of the year are called _____.

Answer 21

cows/pigs
polyestrus
sheep/horses
seasonally polyestrus

Question 22

Theca calls are responsible for synthesizing _____ hormone. This hormone is classified as _____ hormone and is responsible for _____. The hormone that stimulates Theca cells for above mentioned hormone is _____.

Answer 22

testosterone
steroid
production of estradiol
LH

Question 23

What is the predominant steroid hormone during the follicular phase?

Answer 23

Estradiol

Question 24

What is the predominant steroid hormone during the luteal phase?

Answer 24

Progesterone

Question 25

True or False

Ovulation occurs at the end of follicular phase and LH i responsible for this event.

Answer 25

True

Question 26

True or False

During proestrus CL is undergoing regression.

Answer 26

True

Question 27

True or False

During proestrus Graafian follicle has ovulated and estrogen levels have decreased.

Answer 27

False

Question 28

The hormone that is responsible for the CL regression is _____. This hormone is secreted from _____ tissue during _____ stage (and/or phase) of the estrous cycle.

Answer 28

PGF2alpha
Uterine
Late luteal/ Proestrus

Question 29

_____ is the shorter period of the estrous cycle.

Answer 29

Estrus

Question 30

_____ is dominated by developing corpus luteum and moderate progesterone.

Answer 30

Metestrus

Question 31

_____ is the period characterized by increasing estrogen and decreasing in progesterone.

Answer 31

Proestrus