Reproduction 2

• Human reproduction


  Involves two different sex cells: a female ovum and a male sperm
• Children are unique as they have genetic code from both parents
• Male reproductive system


  • Designed to produce and deliver sperm
• Female reproductive system


  • Designed to produce ova, as well as housing, nourishing and protecting a developing foetus
• Pregnancy


  1. Fertilisation

  2. Development of the embryo

  3. Development of the foetus

  4. Birth
• Fertilisation


  1. Ovum is released into the fallopian tubes

  2. Sperm are deposited in the woman's vagina

  3. Sperm swim up to the ovum in the fallopian tube

  4. Only one sperm can fertilise an ovum

  5. Fertilised ovum becomes a zygote
• Development of the embryo

  1. Zygote travels to the uterus

  2. Cells divide and multiply

  3. Embryo fixes itself onto the lining of the uterus
• Development of the foetus

  1. Embryo develops into a foetus

  2. Foetus floats in a sac of amniotic fluid

  3. Foetus receives oxygen and nourishment from the mother's placenta

  4. Waste matter and carbon dioxide are transferred from the foetus to the mother via the placenta

  5. Baby is connected to the placenta by the umbilical cord
• Birth


  1. Foetus pushes against the cervix

  2. Cervix opens and widens

  3. Amniotic fluid is released

  4. Uterus muscles contract

  5. Foetus passes through the cervix and birth canal

  6. Umbilical cord comes out with the baby

  7. Placenta comes out after the baby
• 
  

  During sexual intercourse the man ́s penis is inserted into the woman ́s vagina, and the sperm are deposited there.