the menstrual cycle

• when does the endometrium shred when it its in absence of an implanted embryo

  through menstruation
• When does menstruation occur?

  when there is an absence of an implanted embryo
• from what growth period does the menstruation cycle start

  from puberty
• when will menstruation stop all together in a woman's life

  at menopause
• what does menstruation involve

  brain , ovaries and uterus
• what happens on day 0 of the menstrual cycle

  the anterior pituitary gland secretes FSH
• what is meant by FSH

  follicle-stimulation hormone
• what are the 4 hormones in the menstrual cycle

  LH, FSH, oestrogen and progesterone
• what happens in the menstrual cycle after FSH is released on day 0

  the FSH will trigger the development of a follicle in the ovary and also stimulate the production of oestrogen
• where is oestrogen secreted

  by the developing follicle
• what will the large amounts of oestrogen inhibit in menstruation

  the further production of FSH by negative feedback so no follicles develop
• what will the large amount of oestrogen stimulate in menstruation

  the anterior pituitary gland to secrete luteinising hormone by positive feedback
• what will the large amounts of oestrogen lead to with the endometrium


  growth and repair
• what does high levels of LH initiate

  ovulation
• where is LH secreted

  the anterior pituitary gland
• besides ovulation what also happens due to high levels of LH

  Graafian follicle will develop into the corpus luteum
• where is progesterone secreted

  corpus luteum
• what does the production of progesterone cause

  the further development of the endometrium prior to menstruation
• what does progesterone inhibit

  the release of LH
• what causes the corpus luteum to degenerate

  the falling levels of FSH and LH
• what happens if implantation doesn't occur

  the corpus luteum will degenerate , the progesterone levels fall m the endometrium breaks down and fsh is no longer inhibited so another cycle is initiated
• when is the endometrium broken down


  during menstruation
• When does the follicular phase occur?

  days 1-14
• When does the luteal phase occur?

  days 15-28
• What happens on day 14 of the menstrual cycle?

  ovulation
• what hormone levels will increase on day 14

  oestrogen , LH and FSH
• what is released from the ovary during b ovulation

  the secondary oocyte