The menstrunal Cycle

Question 1

-when does it begin and end
-how many days
-what are the phases

Answer 1

-puberty ends at menopause
-28
1. flow phase
2. follicular phase
3. ovulation
4. luteal phase

Question 2

1. flow phase
   -what is it, how many days
   -what is it initiated by and why (hormones)

Answer 2

-5 days, shedding of the endometrium
-decrease in progesterone and estrogen from the degenerating corpus luteum

Question 3

2. Follicular phase
   -what happens during this phase
   -stimulated by what
   -what hormones are secreted during this phase
   -how many days

Answer 3

-follicular development in the ovary (oogenisis)
-FSH
-mostly estrogen and some progesterone from the follicles
-13

Question 4

3. Ovulation
   -stimulated by what
   -what happens during this phase
   -what day

Answer 4

-spike in LH and small spike in FSH
-oocyte bursts from the ovary and remaining follicular cells start to develop the corpus luteum
-14

Question 5

4. luteal phase
   -what days does it take place from
   -what is secreted from what
   -what is the importance of the hormone secrteted (3)

Answer 5

-15-28
-from the corpus luteum: progesterone and some estrogen
-Progesterone: stimulates and maintains the endometrium for possible embedding of embryo, inhibits uterine contractions and inhibits further ovulation