science

• Fertilisation

  -When the nucleus of the sperm cell fuses with the nucleus of the egg cell

  1. Penis deposits semen containing sperm cell in the vagina 
  2. Sperm cell swim through the cervix, into the uterus and into the oviduct 
  3. Sperm cell meets an egg cell in the oviduct 

  -fertilised egg is implanted in the uterine lining 

  -age, diet, and lifestyle can affect the function of the reproductive system 
• Menstruation 

  -release an egg every 28 days 

  -lining on the wall of the uterus thickens to prepare for implantation 

  -when fertilisation occurs, the lining of the uterus break down 
• Menstrual cycle

  Day 1 to 5

  Menstruation occurs and ends on day 5

  Day 6 to 9 

  Lining on the walls of the uterus thickens and prepares for implantation 

  Day 10 to 15 

  Ovary release egg into the oviduct on day 14 

  Day 16 to 28 

  Uterine lining continues to thickens and the cycle repeats