menstrual cycle

• Hormones


  Chemicals released by glands into the bloodstream that trigger effects in specific target organs
• Endocrine system


  • The system that involves the release of hormones into the bloodstream
• Reproductive hormones


  Hormones that cause secondary sexual characteristics to develop during puberty
• where is Testosterone produced


  • Hormone produced by the testes that stimulates the production of sperm
• where is oestrogen produced


  • Hormone produced by the ovaries that causes eggs to mature
• Menstrual cycle


  1. Egg released every 28 days

  2. Uterus lining becomes thick and spongy

  3. Egg travels to uterus

  4. If egg not fertilized, egg and uterus lining are released as a period
• what does Follicle Stimulating Hormone (FSH)do


  Causes an egg to mature in the ovary
• What does Luteinizing Hormone (LH) do


  Causes the mature egg to be released (ovulation)
• what does Estrogen do


  Maintains the uterus lining
• What does Progesterone do

  Maintains the uterus lining in case the egg is fertilized
• Menstrual cycle hormones


  1. FSH released by pituitary gland

  2. FSH causes egg to mature and ovaries to produce estrogen

  3. Estrogen inhibits further FSH release

  4. LH released by pituitary gland

  5. LH triggers ovulation

  6. Ovary produces progesterone after ovulation

  7. If no fertilization, progesterone levels fall and period occurs
• FSH stimulates follicle growth, while LH triggers ovulation.