D3.1 - menstrual cycle (5h)

Question 1

what 2 cycles makes up the menstrual cycle?

Answer 1

• uterine cycle
• ovarian cycle

Question 2

what are the events in the ovarian cycle?

Answer 2

1. constant development of early-stage follicles.
2. selection of a follicle, containing a maturing oocyte (egg)
   - stimulated by a lack of progesterone and the presence of FSH
3. ovulation - release of the egg from the ovary to the oviduct
   - stimulated by LH
4. empty outer ring of follicle cells becomes corpeus luteum and releases progesterone
5. corpeus luteum degrades after 10-12 days

Question 3

what are events in the uterine cycle?

Answer 3

1. menstruation - loss of the endometrium (uterus lining)
   - lack of progesterone
2. repair and development of the endometrium (uterus lining)
   - stimulated by oestradiol
3. thickening of the endometrium
   - stimulated by progesterone
4. maintenance of the endometrium
   - stimulated by progesterone

Question 4

what is the corpeus luteum?

Answer 4

temporary collection of cells that forms on your ovary each menstrual cycle if you’re still getting a menstrual cycle
- it appears right after ovulation and ensure your uterus is a healthy place for a fetus to grow.

Question 5

what is the role of LH?

Answer 5

luteinizing hormone
- LH peaks trigger ovulation; the oocyte is released from the follicle
- LH triggers development of the corpeus luteum, which secretes progesterone