Coordination and response: The menstrual cycle Flashcards Preview

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Flashcards in Coordination and response: The menstrual cycle Deck (18):
1

how long is an average menstrual cycle

1 month

2

what happens in the middle of the menstrual cycle

event called ovulation, release of a mature egg cell (ovum)

3

where are the eggs released monthly

ovaries

4

AKA fallopian tubes, where eggs pass along these tubes and fertilisation occurs here

oviducts

5

AKA womb, where a foetus develops

uterus

6

where the entrance to the uterus is

cervix

7

where the sperm are received during intercourse and where babies pass through during birth

vagina lel -_-

8

Day 1-5 of the cycle

menstruation: bleeding as uterus lining is shed

9

Day 6-13 of the cycle

new uterus lining develops and new ovum starts to mature in the ovary)
repair of the endometrium ready for a fertilised ovum

10

Day 14 of the cycle

ovulation: ovum shed from ovary and can be fertilised in next 2/3 days then dies if not fertilised within 5/6 days

11

Day 15-19 of the cycle

ovum in fallopian tube, growth of endometrium

12

day 15-28 of the cycle

blood supply develops in new uterus lining

13

day 0-7: pituitary hormones, hormones from ovary, follicle, uterus wall

FSH peaks LH normal
oestrogen and progesterone pretty normal
growth of follicle
bleeding

14

day 7-14: pituitary hormones, hormones from ovary, follicle, uterus wall

FSH falls LH increases to peak at end of this time period
oestrogen peaks to slow down production o FSH, progesterone normal
maturing of ovum and start of ovulation
growth of lining

15

day 14-21: pituitary hormones, hormones from ovary, follicle, uterus wall

LH from peak to falling quickly and FSH normal
oestrogen starting to fall and progesterone beginning to peak preventing release of LH and FSH to stop another ovulation too quickly
ovulation beginning to end, corpus luteum grows
lining getting very thick

16

day 21-28: pituitary hormones, hormones from ovary, follicle, uterus wall

LH and FSH low and level
oestrogen gradually falling progesterone quickly falls low
corpus luteum grows breaks down
lining darkens and thickens

17

what does the corpus luteum do

makes progesterone, which completes the development of the uterus lining so its ready for the fertilised egg

18

what happens to the corpus luteum when an egg is not fertilised

breaks down and stops making progesterone, if the egg is fertilised however then it carries on living and making progesterone, later on in pregnancy the placenta secrets progesterone taking over the role of the corpus luteum