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The menstrual cycle and how it is influenced by different hormones.
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Easy to read essay on The menstrual cycle and how it is influenced by different hormones.
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Describe the menstrual cycle and how it is influenced by different hormones.The menstrual cycle is a series of events that occur in the female body to:
prepare it for possible pregnancy/
Which involves ovarian cycle/
and the uterine cycle/
It takes an average of 28 days /
The pituitary gland //hypophysis
secretes FSH/
which stimulates the development of a primary follicle/ in the ovary
The developing follicle/Graafian follicle:
secretes oestrogen/
which stimulates the thickening of the lining of the uterus/endometrium
Around day 13, the pituitary gland/hypophysis
secretes LH/
which cause ovulation to occur/
The remains of the Graafian follicle develops into the corpus luteum which secretes
progesterone:
which continues to stimulate the thickening of the uterus/
High levels of progesterone/
inhibits the production of FSH/
so that the ovaries are no longer stimulated to produce another follicle/
If fertilisation does not occur, the corpus luteum degenerates/
and stops producing progesterone/
The pituitary gland/hypophysis is no longer inhibited in its production of
FSH/ and a new follicle develops
The thick endometrium is no longer maintained/ it degenerates
and is shed together with blood/menstruation takes place
Any (17)
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