Oestrous Cycle

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  • Menstrual Cycle
    • Key Terms
      • Follicle Stimulating Hormone(FSH)-
        • Stimulates development of follicles in the ovary which produce eggs. Follicles also produce oestrogen.
      • Luteinising Hormone (LH)
        • Causes ovulation to occur and stimulates the production of progesterone
      • Oestrogen
        • Causes the rebuilding of the uterus lining after menstruation and stimulates the pituitary gland to produce LH
      • Progesterone
        • Maintains the lining of the uterus in readiness to receive a fertilised egg. Inhibits the production of FSH
      • Corpus Lutuem
        • Secretes progestereone
    • Sequence
      • 1) Menstrual cycle begins when the uterus lining is shed (days 1-5)
        • FSH released into the blood
          • Stimulates follicles (containing eggs) in the ovary to grow and mature
            • Growing follicles secrete a small amount of oestrogen into the blood
              • This low level of Oestrogen allows the uterus lining to build up. Also inhibits the release of FSH and LH
                • As follicles grow more oestrogen is produced.
                  • Oestrogen reaches a critical point where it stimulates the release of more FSH and LH
                    • Surge in LH causes an egg to be released from a follicle.(ovulation)
                      • After ovulation LH stimulates the empty follicle to develop into a corpus Luteum which produces progesterone
                        • Progesterone maintains the thick lining of the uterus and inhibits release of FSH and LH.
                          • If the egg is not fertilised the corpus Luteum degenerates so no longer   produces  progesterone
                            • Less progesterone causes the uterus lining to break down. FSH no longer prohibited.
          • Less progesterone causes the uterus lining to break down. FSH no longer prohibited.
  • Progesterone maintains the thick lining of the uterus and inhibits release of FSH and LH.
    • If the egg is not fertilised the corpus Luteum degenerates so no longer   produces  progesterone

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