repro 2.1- control of reproductive processes. Flashcards Preview

Skye's ESA 4 > repro 2.1- control of reproductive processes. > Flashcards

Flashcards in repro 2.1- control of reproductive processes. Deck (25):
1

What does sucessful fertilisation depend on?

- correct number of gametes produced at the right time
-effective transport of sperm from male to female
-successful fertilisation
-support of conceptus, embryo and feotus
-support of neonate

2

where does the anterior pituatory gland originate from?

an outpouching of the epithleial tissue from the roof of the mouth,
Known as Rathke's pouch
This then migrates to the adult location

3

What are the main secretions of the anterior pituatary gland?

trophic hormones.

4

Where does the posterior pituitary gland originate from?

a growth from the brain, it is therefore made of nervous tissue.

5

What tissue is the anterior pituitary formed from?

endocrine

6

what 2 types of hormones are produced in the anterior pituitary gland?

glycoprotein hormones
polypeptide hormones

7

What glycopeptide hormones are produced in the anterior pituitary?

FSH, LH
TSH

8

What polypeptide hormones are produced in the anterior pituitary?

growth hormone
prolactin
ACTH

9

What cell types are found in the anterior pituitary?

gonadotrophs
thyrotrophs
somatostrophs
corticotrophs
lactotrophs

10

How is the anterior pituitary secretions controlled?

by control of the hypothalamus.
releasing hormones travel in the hypophysealcirculation as neurosecretions, and act on the anterior pituitary.

11

What releasing hormone controls the reproductive hormones?

FSH and LH crelease is controlled by gonadotrophin releasing homrone (GRH)

12

what's characteristic about the GRH release?

it's pulsatile

13

how can you increase the amounts of LH and FSH released?

increase the frequency or magnitude of pulses.

14

What are the broad functions of LH and FSH?

act on the gonads to stimulate gamete production, and secretion of gonadal steroids.

15

What's the effect of moderate oestrogen levels in a female?

reduction in GnRH levels, normal negative feedback.

16

What's the effect of high levels of oestrogen alone?

positive feedback, increases the amount of GnRH released, and therefore is teh basis behind the LH surge.

17

what's the effects of progesterone on GnRH release?

Only takes effect in the presence of oestrogen:
-moderate oestrogen- increases the inhibitory effect
-high levels of oestrogen, prevents positive feedback, therefore LH surge.

18

with regards to the pulsatile nature of GnRH release, what's the effects of:
a) oestrogen
b) progesterone?

a) oestrogen increases the amount of GnRH per pulse.

b) progesterone affects the frequency of the pulses.

19

What does inhibin do?

Inhibits the release of FSH

20

Where is inhibin released from?

granulosa cells of developping follicles in a woman.
sertoli cells in a man.

21

in the male, what are teh effects of;
LH
FSH

LH binds to Leydig cells, and promotes testosterone secretion
FSH binds to sertolli cells which stimulates inhibin secretion.

22

in the female, what are the effects of
LH
FSH

LH binds to the theca interna cells, leading to production of androgens, which are converted to oestrogen by the granulosa cells.
FSH binds to the granulosa cells, which produce oestrogen and inhibin.

23

in the follicluar phase, what are the actions of oestrogen?

-thin, alkaline cervical fluid
-thickening of the endometrium
-thickening and motility of the myometrium
-increased motility of fimbriae

24

In the luteal phase, what are the actions of progesterone?

-further thickening of the endometrium and myometrium
-thick, acidic cervical fluid
-increased body temperature

25

If fertilisation occurs, what happens to the corpus leuteum?

It is maintained by human chorionic gonadotropin, which is released from the syncitiotrophoblast of the embryo.

Decks in Skye's ESA 4 Class (48):