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Sequencing Events
Directions: The following statements are important events during the menstrual
cycle. Arrange them accordingly. Just use the numbers 1-9.
__ The egg moves through the oviduct and enters the uterus.
__ The pituitary gland controls and starts the cycle.
__ Meanwhile the uterine lining continues to thicken.
__ The ovary releases an egg on day 14. Assume that no sperm is present.
The pituitary gland releases hormones that cause the egg in the ovary to
mature. The luteinizing hormone (LH) initiates the maturation of the follicles,
converts ruptured follicles into corpus luteum and causes the secretion of
progesterone. The follicle stimulating hormone (FSH) assists in the maturation
of the follicles and causes the secretion of estrogen from the follicles.
__ Meanwhile, the ovary itself releases a hormone called estrogen, which causes
the uterine lining to increase in thickness. The uterine lining becomes thicker
so that the fertilized egg can attach to it.
__ After menstruation, the cycle starts again.
__ The egg has not been fertilized, therefore, it will not attach to the uterus.
__ The thick uterine lining is no longer necessary, so the cells of the thickened
uterine lining break of and leave the vagina. The unfertilized egg is lost and
some blood is lost too. This loss of cells from the uterine lining, blood, and egg
is called menstruation.​