2. Which of the following statements is true of the ovarian and uterine cycles: A. Progesterone secretion stimulus that luteal of the uterine cycle. 3. The portion of semen that is composed of alkaline fluid contain fructose and other enzymes produced by: C. Seminal Vesicle 4. The majority of semen is composed of seminal vesicle fluid: True 5.
Mar 03, 2019 · Question 6 Which of the following statements is true of the ovarian and uterine cycles? Selected Answer: Correct: There are multiple follicles that start to develop each month cycle. Question 7 The majority of semen content is composed of seminal vesicle fluid. Selected Answer: Correct: True.
The Ovarian Cycle and the Menstrual Cycle. The ovarian cycle governs the preparation of endocrine tissues and release of eggs, while the menstrual cycle governs the preparation and maintenance of the uterine lining. These cycles occur concurrently and are coordinated over a 22–32 day cycle, with an average length of 28 days.
The first half of the ovarian cycle is the follicular phase shown in Figure 1. Slowly rising levels of FSH and LH cause the growth of follicles on the surface of the ovary. This process prepares the egg for ovulation. As the follicles grow, they begin releasing estrogens and a low level of progesterone.
These cycles occur concurrently and are coordinated over a 22–32 day cycle, with an average length of 28 days.
As women approach their mid-40s to mid-50s, their ovaries begin to lose their sensitivity to FSH and LH. Menstrual periods become less frequent and finally cease; this is menopause. There are still eggs and potential follicles on the ovaries, but without the stimulation of FSH and LH, they will not produce a viable egg to be released. The outcome of this is the inability to have children.
The corpus luteum produces estrogen and progesterone. The progesterone facilitates the regrowth of the uterine lining and inhibits the release of further FSH and LH. The uterus is being prepared to accept a fertilized egg, should it occur during this cycle.
LH and FSH are produced in the pituitary, and estradiol and progesterone are produced in the ovaries. Estradiol and progesterone secreted from the corpus luteum cause the endometrium to thicken. Both progesterone and estradiol are produced by the follicles.
Estrogen is involved in calcium metabolism and, without it, blood levels of calcium decrease. To replenish the blood, calcium is lost from bone which may decrease the bone density and lead to osteoporosis.
If pregnancy implantation does not occur, the lining is sloughed off. After about five days, estrogen levels rise and the menstrual cycle enters the proliferative phase. The endometrium begins to regrow, replacing the blood vessels and glands that deteriorated during the end of the last cycle. Figure 1. Click for a larger image.