Menstrual cycle and menstration

• The menstrual cycle


  1. Prepares a female's body for pregnancy

  2. Usually about 28 days long

  3. Can be as short as 21 days or as long as 45 days
• What happens to the Uterus during the menstral cycle?

  • Develops a thick layer of spongy tissue with blood in preparation for a fertilised egg
  • When the ovum is not fertilised, it passes through the uterus out of the vagina
  • The spongy tissue layer with blood then breaks down and passes through the vagina
• What is Menstruation?

  The flow of blood that passes through the vagina
• A woman menstruates monthly until she is approximately 55 years old
• What is Fertilisation?

  The fusion of a sperm and an ovum
• Explain the term Implantation.

  The fertilised egg embeds firmly into the lining of the uterus
• Pregnant


  Expecting a baby, baby developing in the uterus/womb
• Fertilised egg divides and grows

  1. Divides

  2. Grows
• What is an Embryo?

  The organism that develops from the fertilised egg
• Gestation period


  The period from conception to birth
• Gestation in humans is nine months
• Most women do not menstruate when they are pregnant
• embryo


  fertilised egg divides and grows
• conception


  process when the sperm fuses with the egg
• gestation


  time during which the foetus develops in a womb; time from conception to birth