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Start of cycle FSH levels rise

Start of cycle FSH levels rise. 8. FSH causes follicles to develop and estrogen to be secreted by follicle which causes more FSH to be released. Lining of uterus (endometrium) breaks down (due to low levels of progesterone and estrogen). Rising estrogen levels cause an LH surge. 8.

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Start of cycle FSH levels rise

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  1. Start of cycle FSH levels rise 8 FSH causes follicles to develop and estrogen to be secreted by follicle which causes more FSH to be released Lining of uterus (endometrium) breaks down (due to low levels of progesterone and estrogen)

  2. Rising estrogen levels cause an LH surge 8 LH surge causes ovulation Estrogen stimulates repair of the endometrium

  3. High LH causes less estrogen to be secreted (an example of negative feedback) 8 After ovulation follicle develops into the corpus luteum which secretes progesterone which maintain the endometrium

  4. High levels of progesterone inhibit FSH and LH secretion (negative feedback) 8

  5. If no embryo is formed the corpus luteum breaks down then progesterone and estrogen levels fall and endometrium will break down Low levels of progesterone and estrogen allow levels of FSH to rise 8

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