reproductive system Flashcards
after how many weeks are the embryos differentiated
5-6 weeks become ovaries or testes
hormones influence what happens next eg testosterone causes different growths
7-8 weeks
stretches of male embryo
8-9 weeks
female development
main structures
gonads (testes or ovaries)
ducts
accessory glands
external genitalia
what doe testes produce
spermatozoa
what doe testes produce
spermatozoa
what do ovaries produce
immature ovum - oocytes
why do testes move from inside to outside
due to temperature too hot inside for sperm
spermatogenesis
mitosis become diploid = primary spermatocyte
dna replication & synapsis and tetrad formation
meiosis I = secondary spermatocyte
meiosis II = spermatids
spermiogenesis = physical maturation = haploid spermatozoa
what’s the first male hormone released
GnRH
what does GnRH stimulate
LH and FSH
what do LH and FSH stimulate
interstitial cells and seminiferous tubules
what do interstitial cells stimulate
secretion of testosterone
what do seminiferous tubules stimulate
sustentacular cells
what does testosterone stimulate and inhibit
s = muscle growth, bone growth sex characteristics
I = release of GnRH
what do sustentacular cells stimulate and inhibit
s = synthesis of ABP and spermiogenesis
I = FSH secretion
follicles of ovary
function basic unit
phases of ovarian cycle (endometrial changes)
follicular and luteal
follicular phase of menstrual cycle
destruction of functional zone and repair
14
egg develops in follicle
due to FSH
produces oestrogen
ovulation at end
luteal phase of. menstrual cycle
secretion of endometrial glands
14 days
more constant
progesterone stimulates for conception
phases of uterine cycle (body temp changes)
menses
proliferative
(both lower body temp) at ovulation
secretory HIGHER BODY TEMP
when does oestrogen rise
during follicular phase
when does progesterone increase
luteal phase
what does GnRH stimulate (female)
FSH, LH
