reproductive Flashcards
(321 cards)
describe the HP-GA axis
hypothalamus releases GnRH which stimulates anterior pituitary to secrete LH and FSH.
LH and FSH stimulate the follicle and in return oestrogen is secreted that inhibits the axis.
Theca granulosa cells around the follicle secrete
oestrogen
physiological role of oestrogen is for
development of female sex organs, uterine blood vessels and endometrial development
physiological role of progesterone
thickens both the cervical mucous and maintains endometrium and increases body temp.
age of puberty in females
8-14
age of puberty in males
9-15
average length of puberty
4 years
why may girls with low weight have a delayed puberty
lack of aromatase due to reduced adipose deposits
female puberty starts with development of
breast buds, then pubic hair and then menarche
scale for measuring puberty development is
tanner scale
during puberty FSH levels plateau how long before menarche?
a year
a follicle develops receptors for FSH in which stage?
secondary follicle stage
ovulation occurs what day of the cycle?
day 14
what hormone maintains the corpeus luteum and where does this originate?
HCG from the syncytiotrophoblast
during menstruation what does the stromal cells release
prostaglandins
primary oocyte is contained within
pregranulosa cells surrounded by outer basal lamina layer
three layers of the primary follicle
primary oocyte, zona pellucida and the granulosa cells
as the follicle grows id develops a further surrounding layer called the
theca folliculi
the inner theca folliculi name and function
theca interna secretes androgen hormones
theca externa consists of
connective tissue, smooth muscle and collagen
development of the secondary follicle involves
growth of the antrum within the granulosa. the granulosa cells surrounding the follicle as referred to as the corona radiata.
role of LH in ovulation
surge of LH triggers the theca externa to squeeze releasing the ovum.
primary oocyte meiosis creates
a polar body and a haploid cell called the secondary oocyte.
development of the fertilised cell as it migrated along the fallopian tube
zygote->morula->blastocyst which contains the embryoblast and surrounding this is the trophoblast.