the ovarian cycle

Question 1

how long does the ovarian cycle last for

Answer 1

28 days

Question 2

what are the 2 phases of the ovarian cycle

Answer 2

1. follicular phase
2. luteal phase

Question 3

why is the corpus leteum yellow

Answer 3

contains cholesterol as its a precursor that produces progesterone

Question 4

what happens in the ovary during follicular phase
what anterior pituitary hormone is important in this phase

Answer 4

the primordial follicle develops into secondary follicle. the secondary oocyte is surrounded by granulosa and theca cells.
FSH is important in follicular development

Question 5

what happens in the ovary during luteal phase
what anterior pituitary hormone is important in this phase

Answer 5

mature follicle releases secondary oocyte and corpus lutem develops
the corpus lutem secrets progesterone and oestrogen
corpus luteum degenerates if no fertilisation occurs

Question 6

discribe the events that happen in endometrium during the follicular and luteal phase

Answer 6

menses happens for the first 5 days when the endometrium sloghs off then the proliferative phase starts and lasts between days 5-14 where oestrogen causes the endometrium lining to thicken
the secretory phase then occurs during days 14-28 where progesterion increases blood supply and secretory vesicles

Question 7

a rise in which hormone triggers ovulation

Answer 7

leutinsing hormone (LH)

Question 8

which hormone supports corpus luteum development

Answer 8

LH

Question 9

how do oral conceptions prevent ovulation

Answer 9

oral contraceptions are synthetic estrogen-like and progesterone-like steroids
they inhibit gonadotropin releasing hormone and therefore LH +FSH secretion
as a result follicle development and ovulation doesn’t take place
the endometrium still sloughs off after 3 weeks when the steroids a withdrawn