Menstrual cycle

• Puberty is the period adolescents develop secondary sexual characteristics.
• Secondary sexual characteristics :

  Breast development

  More muscle mass

  Facial hair

  Height increase

  Deepening voice
• Which organ is testosterone released from?

  Testes
• Is oestrogen the main sex hormone in males or females?

  Females
• Which organ is oestrogen released from?

  Ovaries
• How long does the average menstrual cycle last?

  28 days
• The menstrual cycle is a series of

  steps that prepares the uterus for the implantation of a fertilised egg.

  If there is no fertilised egg, then the cycle repeats.

  But if there is, then the cycle will stop and the egg will implant into the uterus lining, and develop into a foetus.
• What happens in stage 1 of the menstrual cycle?

  Period of bleeding as the uterus lining breaks down.
• What happens in stage 2 of the menstrual cycle?


  Building up of the uterus lining.
• What happens in stage 3 of the menstrual cycle?

  Release of the egg from the ovaries.
• What is the name of stage 3 of the menstrual cycle?

  Ovulation
• What happens in stage 4 of the menstrual cycle?

  Maintenance of uterus lining.
• What happens after stage 4 if there is no fertilised egg?

  The cycle repeats.
• Which hormone stimulates the uterus lining to develop?

  Oestrogen
• Which organ are both luteinising hormone and follicle stimulating hormone released from?

  Pituitary gland.
• Which hormone stimulates the egg to be released around day 14 (ovulation)?

  Luteinizing hormone (LH)
• Which hormone stimulates the egg follicle to mature?

  Follicle stimulating hormone (FSH)
• Which hormone maintains the lining of the uterus?

  Progesterone