BIOL 1003 Lecture Notes - Luteal Phase, Fetus, Glycoprotein

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Anterior pituitary gland is secreting follicle-stimulating hormone fsh. Stimulates development (division) of follicle cells surrounding oocyte. Stimulates proliferation of endometrium and its blood supply. Stimulates anterior pituitary gland to secrete luteinising hormone lh. Inhibits further secretion of fsh by negative feedback. Mature ovarian follicle bursts and releases secondary oocyte (now called ovum!) Corpus luteum forms from remaining follicle cells in ovary. Ovum passes down fallopian tube/oviduct towards uterus; fertilization now possible: happens once a month, menstrual cycle 28days, each ovary alternatively releases an ovum every 56days ( 56/2) Progesterone continues to stimulate: profileration of endometrium and its blood supply, development of nutrient fluid glands in uterus lining. High levels of sex hormones inhibit secretion of lsh and lh. Corpus luteum degenerates \ levels of sex hormones fall. Uterus lining breaks down; fsh is not inhibited anymore cycle starts again. Menstruation [days1-5] endometrium breaks down: low levels of female sex hormones causes.

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