human reproduction

• during puberty, reproductive hormones are released which cause secondary sex characteristics to develop
• testosterone is the main male reproductive hormone produced by the testes and it stimulates sperm production
• oestrogen is the main female reproductive hormone produced in the ovary. At puberty, eggs begin to mature and one is released approximately every 28 days - this is called ovulation
• • FSH released from pituitary gland
  • causes the maturation of an egg in the ovaries
  • FSH triggers the production of oestrogen
  • oestrogen causes the uterus lining to thicken, and inhibits FSH production
  • oestrogen stimulates the production of LH in the pituitary gland
  • LH causes the release of the egg into the uterus (known as ovulation)
  • the egg is released from the follicle
  • the empty follicle because a yellow body which releases progesterone
  • egg isn't fertilised, yellow body breaks down & progesterone levels drop
  • egg is fertilised, yellow body produces progesterone and lining's maintained
• follicle stimulating hormone (FSH) causes the maturation of an eggin the ovary
• luteinising hormone (LH) stimulates the release of an egg from the ovary into the uterus
• oestrogen and progesterone are involved in the thickening and maintaining of the uterus lining