HORMONES

• FOLLICLE STIMULATING HORMONE (FSH)

  • Causes egg to MATURE in the OVARY
  • Secreted from the PITUITARY gland
  • Travels to the OVARIES & TRIGGERS the production of OESTROGEN
  • There are HIGH levels of FSH before the OESTROGEN is produced, but the OESTROGEN produced INHIBITS FSH and produces LH
• LUTEINISING HORMONE (LH)

  • Secreted by the PITUITARY gland
  • Causes the MATURE egg to be RELEASED
  • This is called OVULATION
• OESTROGEN:

  • Secreted by the OVARIES
  • Causes the lining of UTERUS to DEVELOP
  • INHIBITS the release of FSH
  • STIMULATES the release of LH
• PROGESTERONE:

  • MAINTAINS the lining of UTERUS (keeps it THICK so that an egg can IMPLANT)
  • INHIBITS the release of FSH & LH (eggs cannot MATURE and be RELEASED)
  • No FERTILISATION- progesterone levels FALL (period occurs)