menstruation cycle

• What is the main focus of today's video?

  The reproductive hormones and the menstrual cycle
• What is puberty?


  It is the period during which adolescents develop secondary sexual characteristics
• What are secondary sexual characteristics in men?

  Facial hair
• What hormone triggers puberty in men?

  Testosterone
• Where is testosterone produced in men?


  In the testes
• What hormone is primarily responsible for female puberty?

  Estrogen
• Where is estrogen produced in women?

  In the ovaries
• What are the four stages of the menstrual cycle?

  1. Menstruation
  2. Uterus lining buildup
  3. Ovulation
  4. Maintenance of the uterus lining
• What is the average length of a menstrual cycle?

  Around 28 days
• What happens during menstruation?

  It is the period of bleeding due to the breakdown of the uterus lining
• How long does menstruation typically last?

  About four days
• What occurs in stage two of the menstrual cycle?

  The uterus lining starts to build up and becomes a thick spongy layer
• How long does stage two of the menstrual cycle last?

  Around ten days, up to day 14
• What is the role of the thick spongy layer in the uterus lining?

  To prepare for the implantation of a fertilized egg
• What is ovulation?


  The release of an egg from one of the ovaries
• How long does ovulation last?

  It takes place in a single day
• What happens in stage four of the menstrual cycle?

  It involves maintaining the lining of the uterus
• What occurs if no fertilized egg reaches the uterus by the end of the cycle?

  The uterus lining breaks down and the cycle restarts
• What happens if a fertilized egg implants into the uterus lining?

  The menstrual cycle stops because the woman is pregnant
• What hormone stimulates the growth of the uterus lining?

  Estrogen
• What hormone maintains the lining of the uterus?

  Progesterone
• What are the two hormones produced in the ovaries?

  Estrogen and progesterone
• What are the two hormones produced in the pituitary gland?

  Luteinizing hormone (LH) and follicle stimulating hormone (FSH)
• What is the role of follicle stimulating hormone (FSH)?


  To stimulate one of the eggs to mature in one of the ovaries
• What does luteinizing hormone (LH) stimulate?

  The release of the egg on day 14, known as ovulation
• How do the hormones interact during the menstrual cycle?

  • FSH stimulates the ovaries to produce estrogen.
  • Increased estrogen inhibits FSH (negative feedback).
  • High estrogen levels stimulate the release of LH, causing ovulation.
  • Progesterone inhibits both LH and FSH.
• What is the significance of negative feedback in the menstrual cycle?

  It helps regulate hormone levels to maintain balance