TBL Pregnancy and Lactation Flashcards Preview

Block 3 Week 8 > TBL Pregnancy and Lactation > Flashcards

Flashcards in TBL Pregnancy and Lactation Deck (124)
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1

What does estrogen (high amounts or low amounts) do for the females?

causes proliferation of endometrium
thinning of cervical mucus
stimulate pituitary to secrete LH
LH surge at mid-cycle-> ovulation
stimulate progesterone production

2

LH surge causes completion of (blank)

meiosis I in the preovulatory follicle

3

What stage is the oocyte in 3 hrs before ovulation?

arrested in metaphase of meiosis II

4

What is happening on the ovarian surface during ovulation?

You have increase LH which will increase collagenase which will digest fibers to allow for ovulation.
Increase LH will increase prostaglandin which will increase muscular contraction

5

What are the lutean cells?

granulosa cells and theca cells

6

What does the corpus luteum secrete?

progesterone and estrogene

7

What does progesterone and estrogen do to the uterus?

turns the uterine mucosa into progestational/secretory stage in preparation for implantation

8

How do we get the ovulated oocyte into the uterus?

via fimbriae of uterine tube and cilia on eptihelium

9

How long does it take for the oocyte to transport from ampulla to uterine lumen?

3-4 days

10

Where does fertilization occur?

at the ampulla of the uterine tube

11

What happens if there isnt fertilization?

lutean cells undergo apoptosis and you get a corpus albicans and decrease of progesterone which will result in menstrual bleeding

12

If the oocyte is fertilized what will happen?

hCG secreted by syncytiotrophoblast further growth

13

How long will the corpus luteum secrete progesterone?

for four months until the trophoblast takes over the secretion of progesterone

14

Explain the transport of spermatozoa in the male

epidydimis (via testicular fluid)-> maturation in epididymis-> ductus deferens-> seminal vesicles-> prostate

15

Explain the transport of spermatozoa in the female

upper vagina (rapid elevation of pH)-> cervix-> uterus-> uterine tubes

16

How many sperm enter the vagina and then on?

vagina (10^7)-> cervix (10^6)->uterus (10^5)-> uterine tubes (10^4)-> near egg (10^2-3)

17

How many sperm arrive at distal end of fallopian tube?

50 or less

18

What day is the egg at the ampullary-isthmic junction after ovulation (where fertilization occurs)?

days 1-2

19

What day is the egg at the utero-tubal junction after ovulation?

days 2-3

20

How many days does the egg take to enter the uterine cavity as a morula?

days 3-4

21

How many days after ovulation does the blastocyst implant?

day 7

22

What is capacitation?

maturation of sperm in female reproductive tract.
removal of glycoproteins and seminal plasma proteins form sperm PM

23

What is the acrosome reaction?

release of enzyme by sperm to dissolve ZP

24

Where does fertilization occur?

at ampulla of uterine tube

25

What is phase I of fertilization?

penetration of corona radiata

26

What is phase II of fertilization?

Penetration of zona pellucida

27

What is phase III of fertilization?

fusion of the oocyte and sperm cell membranes

28

How long does it take for the sperm to penetrate the zona pellucida?

15-25 min

29

How long does the sperm spend in the perivitelline space?

less than 1 seconda

30

How long is the sperm in the perivitelline membrane?

less than 1 minute