Shared Flashcard Set

Details

Repro
Sperm Transport, oogenesis
16
Agriculture
Undergraduate 3
11/17/2014

Additional Agriculture Flashcards

 


 

Cards

Term
capacitation
Definition
- sperm acquire fertility in female tract
- acrosome alteration
- not fully reversible
- 50-240 minutes
- initiated in cervix by seminal plasma
- completed in isthmus during detachment from sperm reservoir by female derived factors
Term
hyperactivation
Definition
-increase in flagellar bend amplitude & asymmetry
-enhances release from sperm reservoir, progressive motility & sperm penetration of cumulus ECM
-results in tryosin phosphorylation of AKAP83 & other proteins
-reversible
Term
oocyte transport controls
Definition
-estrogen domination
-isthmus & uterus have lots of sympathetic nerves
-stimulatory (alpha) & inhibitory (beta) receptors increase
-stimulatory --> contraction of isthmus
-inhibitory --> relaxation of isthmus --> embryo transported to uterus
Term
chemotaxis
Definition
-chemo-attractants may be present in follicular fluid that accompanies the eggs
-sperm get chemotactic responsiveness
Term
thermotaxis
Definition
secondary difference between isthmus & ampulla
exposure to cumulus cells alter sperm motility
Term
4 phases of oocyte maturation
Definition
1. mitotic divisions of primordial germ cells
2. nuclear arrest
3. cytoplasmic growth
4. resumption of meiosis following LH surge
Term
primoridal germ cells (2n)
Definition
-migrate to developing gonads
-10-20 um
-mitotic divisions (start with a few, end with millions)
-after mitotic stage (dna snythesis)
Term
primary oocyte (4n)
Definition
-progress to 1st mitotic prophase
-arrest in prophase 1 (pause button)
Term
primordial follicle
Definition
-primary oocyte
-single layer squamous epithelial cells
-primordial resting pool
Term
primary follicle
Definition
-primary oocyte
-single layer of 11-20 cuboidal granulosa cells
-begin to increase in organelles (smooth, rough er, elongated & dividing mitochondria)
Term
secondary follicle
Definition
-primary oocyte
-2nd layer of granulosa cells
-initial deposition of zona pellucida glycoproteins
-oocyte begins RNA synthesis
Term
Zona Pellucida
Definition
made of glycoproteins PRODUCED BY THE OOCYTE
-sperm bind to zona protein 3
Term
early tertiary follicle
Definition
primary oocyte
oocyte begins to grow, becomes transcriptionally active
Term
tertiary follicle
Definition
primary oocyte
oocyte growth stops
perivitelline space appears
free smooth and rough er decrease
hooded mitochondria appear
mitochondria, golgi bodies, cortical granule clusters & migrate to periphery
Term
dominant follicle
Definition
primary oocyte
increase in lipid content
decrease in size of golgi
cortical granules move closer to plasma membrane
Term
LH surge changes
Definition
cortical granules move inside of plasma membrane
perivitelline spaces completely formed
increase in lipid content
decrease in golgi bodies
*meiosis resumed
Supporting users have an ad free experience!