oogenesis and spermogenesis Flashcards
when anovulation
5 yrs after menarche and perimenopause
chronic anovulation
6-15%
what is anovulation
cycle happens but no egg released
what/where is sperm capacitation - what’s the point
in female reproductive system prepares head of the sperm (acrosome) to access oocyte.
plasma membrane more fluid - breakdown cholesterol
takes in Ca+
sperm ++motility
when does recombination happen
between prohase 1 and metaphase 1
what creates the tight junctions in the testes
sertoli cells
what is acrosome
how capaciation in ivf
hco3 and albumin baths
where fertilisation
ampulla of fallopian tube
what is rheotaxis
swimming against tide
how do sprem know l or r
formyl MLF released from oocyte
how does fertilised egg stop polyspermy
fast block Na+ flux into oocyte witihn 3 secs makes oocyte membrane positive (depolarise)
slow block - cortical granules directly under membrane - release Ca2+ wave which triggers completion of meisis 2
zona pellucida becomes hard and crystalline
when is morula
day 3 16 cells
what does trophoblasts besome
placenta (outer shell of blastocyst)
