Occurs every 28 days divided into 4 stages Menarche age of first period Starts puberty some as young as 9 and as late at 17 years Avg age bt 12 amp 15 Facts Amenorrhea absence of menstrual cycle ID: 597407
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Slide1
The Menstrual cycleSlide2
Occurs every 28 days, divided into 4
stagesMenarche = age of first periodStarts @ puberty – some as young as 9 and as late at 17 yearsAvg age b/t 12 & 15
FactsSlide3
Amenorrhea
– absence of menstrual cycleCauses: psychological factors, anorexia, hormonal imbalance, pregnancyMenorrhagia – abnormally heavy & long menstrual periodsPrementrual Syndrome (PMS)
– group of
sx prior to ones menstrual cycle Cause: water retention in body tissue. Sx: irritability, nervousness, mood swings, weight gainDysmenorrhea – painful menstruation
Menstruation disordersSlide4
FSH from
pituitary to ovary stimulates follicle with ovum to maturereleases estrogen and prepares uterine lininglasts 10 days
Stage 1:
Follicle StageSlide5
When the concentration of estrogen in the female bloodstream reaches a high level – it causes the pituitary gland to stop FSH secretion.
LH is secreted by pituitary glandNow estrogen, FSH, & LH circulating which causes release of mature follicleUsually around day 14Stage 2:Ovulation stageSlide6
Corpus
luteum (group of ruptured follicle cells) secretes progesterone.which prevents further ovulation and maintains uterine lining for possible embryolasts 14 daysStage 3
Corpus
Luteum StageSlide7
If fertilization does not occur :
-progesterone reaches a level in bloodstream that inhibits LH secretion & corpus luteum breaks down causing a decrease in progesterone secretion. -Lining of the endometrium becomes progressively thinner and eventually breaks down. -Extra layers of endometrium, unfertilized egg, & small quantity of blood from ruptured capillaries are discharged through the vagina. -Starts around day 28 of
cyele
and lasts about 4-5 days. -Anterior pituitary now stimulated to secrete FSH for a new follicle and the cyle starts over. Stage 4:menstruation stage