Reproductive hormones

• Puberty

  Period in which adolescents start to develop secondary sexual characteristics
• What causes puberty

  Testorerone - Males

  Oestrogen - Females
• What secondary characteristics do men develop

  Height

  Deeper voice

  More muscle mass

  Testes start producing sperm

  Growth of pubic hair
• What secondary characteristics do females develop

  Height

  Breasts grow

  Hips become wider

  Menstrual cycle starts

  Growth in pubic hair
• Menstrual cycle

  Series of steps that prepares the uteries for the implantation of a fertilised egg.
• Stage one of menstrual cycle (Day 0-4)

  Menstruation
• What is menstruation

  Bleeding as the uterus lining breaks down
• Stage two of menstrual cycle (Day 5-14)

  Uterus lining builds up and gets thicker
• Why must the uterus lining get thicker

  So that a fertilised egg can implant into the wall
• Stage three of menstrual cycle (Day 14)

  Ovulation
• What is ovulation

  Release of an egg from an ovary
• Stage four of menstrual cycle (Day 15-28)

  Uterus lining is maintained
• What happens after stage four

  Cycle repeats
• What happens if a fertilised egg does implant into the lining

  The cycle will pause and the lining will be maintained to allow the fertilised egg to develop
• FSH

  Follicle Stimulating Hormone
• LH

  Luteinising hormone
• What organ releases FSH and LH

  Pituitary gland
• Role of FSH in the menstrual cycle

  Stimulates egg in the ovaries to mature
• Role of LH in the menstrual cycle

  Stimulates a mature egg to be released from the ovary
• Role of oestrogen in the mentrual cycle

  Stimulates the uterus lining the thicken
• Role of progesterone in the menstrual cycle

  Maintains the uterus lining after ovulation