Lecture 24: Oogenesis and Ovulation-extra emphasis 🥚

What is name of the diploid stem cell in oogenesis?

oogonium

What is the name of the oocyte that begins meiosis I but arrests in prophase I?

primary oocyte

When is meiosis I completed in oogenesis?

just before ovulation

What type of oocyte is ovulated?

secondary oocyte

When is meiosis II completed in oogenesis?

after fertilization

What are the three phases of the ovarian cycle?

follicular phase, ovulation, luteal phase

What days of the 28-day cycle make up the follicular phase?

day 0 to day 14

What hormone mainly rises during the follicular phase?

estrogen

What hormone event riggers ovulation?

LH surge

What day does ovulation occur?

day 14

What oocyte is released during ovulation?

secondary oocyte

What does the corpus luteum secrete?

progesterone, estrogen, inhibin

What days make up the luteal phase?

day 14 to day 28

What hormone dominates the luteal phase?

progesterone

What happens to hormone levels if fertilization does not occur?

estrogen and progesterone drop

What are the three phases of the uterine cycle?

menstrual, proliferative, secretory

What days of the cycle make up the menstrual phase?

day 0 to day 5

What hormone causes menstruation to begin?

drop in progesterone

What days make up the proliferative phase?

day 6 to day 14

What hormone causes regrowth of endometrium?

estrogen

What days make up the secretory phase?

day 15 to day 28

What hormone maintains the secretory phase?

progesterone

What is the timing/start of oogenesis?

before birth

What is the timing/start of spermatogensesis?

at puberty

How many gametes result from one primary spermatocyte?

four sperm

How many gametes result from one primary oocyte?

one ovum