Part 2 The Menstrual Cycle Signifies a womans ability to bear children Menarche usually occurs between 1114 years of age On average a menstrual cycle lasts 28 days Involves a delicate interplay of ID: 637744
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Slide1
HHD
Physical characteristics of youths’ development
(Part
2)
The Menstrual Cycle Slide2
Signifies a woman’s ability to bear children
Menarche usually occurs between 11-14 years of age
On average, a menstrual cycle lasts 28 daysInvolves a delicate interplay of hormonesOestrogen, Progesterone, FSH and LH are all present during the menstrual cycle. However, the release of and contribution of these hormones occurs at different stages during the 28 day cycle. The menstrual cycle explained
The Menstrual CycleSlide3
Day 1-7
Bleeding commences
Lining of uterus (endometrium) is dischargedPituitary gland releases FSH which travels in bloodstream to the ovariesFSH stimulates an ovum to start maturing in follicleFollicles are small sacs that contain an immature ovum as it develops
Fallopian Tube Slide4
Day 7-12
As follicles begin to mature, oestrogen is released by the ovaries
Oestrogen travels to the uterus where it stimulates the growth of a new blood lining to prepare for possible pregnancy
(blood lining)
OestrogenSlide5
Day 13-15
High Oestrogen levels cause the pituitary gland to switch from making FSH to LH, which stimulates ovulation
Oestrogen
LHSlide6
Day 14. Ovulation
The LH hormone causes the follicle to burst, releasing an egg from an ovary into the fallopian tube.
This process is called ovulation Peak fertility time The empty follicle is now called the corpus luteumSlide7
Day 15-28
Ovum travels down fallopian tube and into uterus
Follicle keeps on making Oestrogen and Progesterone which causes the endometrium to continue to thicken in case conception occurs If ovum is fertilised by sperm it implants into endometriumUnfertilised egg diesAt end of cycle, hormone levels drop and next menstrual cycle beings on day 28
Endometrium continues to thicken
Ovum
Follicle
Progesterone
Oestrogen