Female ovulation stuff Flashcards
What are the three phases of ovulation and what are their days?
Proliferative days 6-16
Secretory 17-28
Menstrual day 1-5
What is happening during the proliferative phase ?
What days?
Days 6-16
Stromal cells proliferate due to estrogen in new endometrial layer that’s forming.
Blood vessels grow and support the new endometrium
What is happening during the secretory phase?
what days?
17-28
Progesterone cause swelling and development of the endometrium. Blood vessels are enlarged. Getting rdy for implantation.
What is the menstrual phase? What days?
1-5
No ovum implanted, the corpus luteum wll involute causing a decrease in progesterone and estrogen
Priming a release of FSH starting the cycle over again
If estrogen acts as part of the negative feedback loop for GnRH, then what has to happen before it can be a postitive feedback?
When does this happen?
What does this cause?
Have to reach the estrogen threshold
Day 12/14
Surge in LH causing ovulation
Hormonally , if an egg is implanted in the uterus, what happens?
hCG is produced by the placenta and inhibits FSH, stopping further cycling,
After 8 weeks the placenta can make its own hormones (progesterone) to maintain pregnancy
Hormonally, if an egg is not implanted, what happens?
The corpus luteum is causing a negative feedback on Lh/FSH at the time. The corpus luteum slowly degrades to the corpus albicans, producing less and less progesterone and estrogen.
Ones estrogen and progesterone are low enough, then the FSH will be produced again
What does high pulsing and low pulsing GnRH release?
high: LH
Low: FSH
