Ovulatory phase

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A-Levels Biology 5 (Nerves and Muscles) Mind Map on Ovulatory phase, created by harry_bygraves on 15/06/2013.
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Mind Map by harry_bygraves, updated more than 1 year ago
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Created by harry_bygraves over 11 years ago
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Ovulatory phase
  1. At about day 13 to 15 in humans, the level of oestrogen increases rapidly. A slow rise in levels of oestrogen in follicular phase inhibits GnRH production however, at a critcial high level, oestrogen stimulates the hypothalamus to secrete more GnRH. GnRH secretion is also enhanced by a temporary increase in FSH and a suuden release of LH from the pituitary gland. This massive outpouring of LH is called the ovulatory surge. The surge of LH and FSH brings about ovulation, the release of a secondary oocyte from an ovarian follicle. These effects are a result of postive feedback.
    1. Immediatly after ovulation, a women is fertile and can concieve if she has sexual intercourse, or if sperm is already present in her oviducts
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