97.ovarian cycle/ovulation

Question 1

definition of ovulation

Answer 1

cyclic proccess.
mature follicle ruptures and releases secondary oocyte
takes place on the 14-15th day
corona radiata travels with oocyte to the uterine tube

Question 2

How is the ovarian cycle regulated

Answer 2

controlled by hypothalmus
releases Gonadotropin releasing hormone (GnRH)
which allows gonadotropins to release= FSH+LH

Question 3

At the beginning of each ovarian cycle, what grows and what stimulates it

Answer 3

15-20 primary follicles stimulated to grow under FSH

Without it, these primary follicles become atretic (degenerates)

Question 4

ovarian cycle (timeline)

Answer 4

. lasts 28 days
. day 0 = primoridial follicle
. day 13 secondary oocyte ruptures from graafian cell (ovulation)
. day 15-28 getting back to primordial follicle

Question 4

ovarian cycle (timeline)

Answer 4

. lasts 28 days
. day 0 = primoridial follicle
. day 13 secondary oocyte ruptures from graafian cell (ovulation)
. day 15-28 getting back to primordial follicle

Question 5

late primary follicle contains zona pelicuda, granulusa cells and outside is the theca. what binds to the theca

Answer 5

Lh bind to theca + makes androstenedione.
These are given to granulosa cells + make oestrogen
increases oestrogen levels in blood

Question 6

how many oocytes are ovulated and what happens to the rest

Answer 6

1 oocyte ovulated from mature follicle.
rest (15-18) shed in menstrual cycle.

Question 7

what happens to the follicle after the oocyte rupture for ovulation

Answer 7

turns into the corpus lutetium ( yellow body)
if there no fertilisation of oocyte then CL goes through apoptosis= corpus albicans (this is where u get menstrual bleeding)

if fertilised CL persists due to human chorionic gonadotropin (hCG) this is secreted by the synctiotrophoblast

Question 8

what happens in menapause

Answer 8

ovulation stops. ovary doesnt respond to FSH +LH

Question 9

ovarian vs menstrual cylce

Answer 9

menstrual cycle is about release of hormones and maintaining uterine lining
ovarian cycle is the maturation of the ovarian follicles

Question 10

ovarian vs menstrual cylce

Answer 10

menstrual cycle is about release of hormones and maintaining uterine lining
ovarian cycle is the maturation of the ovarian follicles

Question 11

menstrual cycle?

Answer 11

menstrual cycle (28 days)

✓menstruatation – 3-5 days

✓proliferative (follicular)
phase – 5-14 day

✓luteal phase
till 26-27 day

✓premenstrual (ischemic)
phase – 1-2 days

▪ fertile window – 7 days total
5 days before ovulation
+ 1–2 days after ovulation