038 Fertilization and gametogenesis Flashcards
1
Q
When does the urogenital ridge appear?
A
4 weeks
2
Q
When does sex determination occur?
A
7 weeks
3
Q
What is the sperm receptor on zona pellucida?
A
ZP3
4
Q
How is polyspermy prevented?
A
Depolarisation causes membrane to be unable to fuse with another sperm. It also triggers release of Ca2+ intracellularly by activation of PLC. IP3 and DAG stimulate exocytosis of secretory vesicles.
5
Q
What does the trophoblast secrete during successful implantation, and what does this hormone do?
A
HCG, acts like luitenizing hormone and maintains corpeus leuteum
6
Q
When do HCG levels peak?
A
6-8 weeks after fertilisation
7
Q
How long is the life of corpus luteum?
A
2 weeks
