Quiz 2 Flashcards
explain the acrosome reaction
acrosin digests a hole in the zona pellucid so that the sperm can penetrate
name the 2 blocks to polyspermy that are induced by the cortical reaction.
vitelline block & zona reaction
are the cells of the 8-cell embryo considered totipotent? And define totipotent.
yes. means each cell has all of the DNA required to make an individual
what is “cleavage” of the early embryo
means that each cell is replicated and divided into 2 separate identical cells
true or false. A primordial follicle contains a primary oocyte surrounded by the zone pellucida and a single later of cubodial granulosa cells.
false
at what stage of meiosis would the oocyte of a small astral follicle be arrested?
prophase II
how did scientists determine that that the pre-antral follicle development was non-dependent on gonadotropins?
they took out the hypothalamus stage of the feedback loop (that produces gonadotropins) & saw that it was still functional
true or false. At the time of recruitment, granulosa cells express receptors for LH and theca cells express receptors for FSH.
false. at selection granulosa cells gain LH receptors as well
name the hormone that causes the recruitment of a cohort of follicles
Follicle Stimulating Hormones
true or false. In a dominant follicle, the theca interna is steroidogenic and produces estradiol.
false. theca interna - cholesterol & produces androstendione
steroid hormones are derived from ______.
cholesterol
steroidogenic acute regulatory protein (STAR protein) is important for the ___________.
movement of cholesterol into cell where it can be broken down
how is estradiol produced by a dominant follicle?
recruitment and selection makes a dominant follicle then star protein turn cholesterol into adrosteindione, and then to estradoil
name the hormone that induces regression of the CL and where is it produced?
PGF2alpha - in the uterus
