menstrual cycle

Question 1

what are the 3 phases of the menstrual cycle?

Answer 1

1. preovulatory phase
2. ovulatory phase
3. postovulatory phase

Question 2

explain the preovulatory phase

Answer 2

1. Days 2 to 6, menstrual flow takes place
2. The pituitary gland secretes the hormone FSH, which stimulates the development of follicles in the ovaries.
3. The follicle develops and begins to make estrogen, which in turn thickens the lining of the uterus (endometrium) with blood and tissue.
4. When estrogen levels are high, the pituitary glands stops making FSH and begins making LH.

Question 3

explain the ovulatory phase

Answer 3

The increased amount of LH allows the follicle to break and release the secondary oocyte (ovulation).

Question 4

explain the postovulatory phase

Answer 4

1. After the follicle has burst, estrogen levels drops slightly.
2. The drop in LH cause the follicle to transform in a corpus luteum.
3. The corpus luteum secretes progesterone and estrogen to continue to thicken the lining of the uterus. This prepares the uterus to receive a fertilized egg.
4. High levels of progesterone and estrogen reduce the production of FSH and LH.
5. When fertilization happens, the corpus luteum continues to secrete estrogen and progesterone to maintain the blood in the uterus.
6. When fertilization doesn’t happen, the corpus luteum breaks down, estrogen and progesterone levels decrease, the uterus lining is shed during menstruation and a new cycle begins.