Human reproduction

• What is the cell called formed after fertilisation?

  Zygote
• Define fertilisation in humans


  When the nucleus of the sperm cell fuses with the nucleus of the egg
• Where are human male gametes produced?


  Testes
• Where are female gametes produced?


  Ovaries
• Why do sperm cells have lots of mitochondria?


  So they have lots of energy for swimming
• How many chromosomes are found in male and female gametes?


  23
• How many chromosomes does a zygote have?


  46
• Where does fertilisation take place in a human?


  Fallopian tube (oviduct)
• What is the role of the placenta?

  • Provide oxygen/nutrients from mothers blood to Fetus
  • Remove carbon dioxide/waste products from Fetus
• 4 examples of secondary male sex characteristics that occur during puberty

  • growth of male sex organs
  • Start of sperm production
  • Increase of muscle mass
  • Voice deepens
• What is the main female reproductive hormone?

  Oestrogen
• Name the process where a matured egg is released from the ovaries

  ovulation
• Name the hormone that stimulates the build up of the uterus lining

  Oestrogen
• Name the hormone that maintains the uterus lining

  Progesterone
• name the main male reproductive hormone

  Testosterone
• Which organ produces testosterone?

  Testes
• what is the average length of the menstrual cycle?

  28 days
• Which two female hormones are released from the ovaries during the menstrual cycle?

  • Oestrogen
  • progesterone