REPRODUCTION
HUMAN REPRODUCTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle
|
|
|
Menstruation occurs just after LH and FSH levels peak
|
|
|
Menstruation occurs after progesterone levels drop
|
|
|
Estrogen levels rise before ovulation, while progesterone levels rise after
|
Detailed explanation-1: -Statement c is false. Just prior to the middle of the cycle (approximately day 14), the high level of estrogen causes FSH and especially LH to rise rapidly, then fall. The spike in LH causes ovulation: the most mature follicle, like that shown in Figure 2, ruptures and releases its egg.
Detailed explanation-2: -The first day of menses is identified as cycle day one. Estrogen is at a low point. Therefore, the pituitary secretes FSH and LH, a process which actually begins before the onset of your menses. These hormones in turn stimulate the growth of several ovarian follicles, each containing one egg.
Detailed explanation-3: -Corpus luteum secretes a large amount of progesterone in the secretory phase. Both LH and FSH attain a peak level in the ovulatory phase (mid of the cycle). Was this answer helpful?
Detailed explanation-4: -Ovulation: A surge in LH causes your ovary to release a mature egg around the second week of each menstrual cycle. A high LH level around this time means that you’re at that moment in your cycle when you’re most likely to get pregnant.
Detailed explanation-5: -Rising estrogen levels also send a signal to your pituitary gland to slow FSH production. Meanwhile, levels of another pituitary hormone called luteinizing hormone (LH) surge. The rise in LH halts estrogen production and starts the process of ovulation, the next phase in the cycle.