The interplay of tropic and sex hormones regulates mammalian reproduction - The reproductive cycles of females - The uterine cycle
6 important questions on The interplay of tropic and sex hormones regulates mammalian reproduction - The reproductive cycles of females - The uterine cycle
What phases does the uterine cycle consist of?
- proliferative phase
- secretory phase
- menstrual flow phase
How come the follicular phase of the ovarian cycle is coordinated with the proliferative phase of the uterine cycle?
Because the growing follicle starts secreting more estradiol and progesterone the endometrium starts to thicken, preparing to support an embryo
What happens in the secretory phase of the uterine cycle and how is it coordinated with the luteal phase in the ovarian cycle?
After ovulation the corpus luteum keeps secreting estradiol and progesteron, this means the endometrium is maintained and the arteries end endometrial glands keep developing.
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What do endometrial glands do?
They secrete nutrient fluid that can sustain an embryo even before it implants in the uterine lining.
What causes menstruation and what happens in the uterus during menstruation?
The disintegration of the corpus lutheum causes the estradiol and progesterone levels to drop causing arteries in the endometrium to constrict. Because there is no circulation anymore the endometrium desintegrates and the uterus contracts. The endometrial tissue, fluid and blood is released through the cervix and the vagina.
What happens in the ovaries during menstruation?
The new group of follicles begin to grow, . So the beginning of the menstruation is considered the first day of a new cycle.
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