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Biology: The Unity and Diversity o...
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During a menstrual cycle, a midcycle surge of ______ from the ___ triggers ovulation.
- a. FSH; pituitary
- b. progesterone; egg
- c. LH; pituitary
- d. estrogen; follicle cells
Concept introduction: The human menstrual and ovarian cycles are coordinated cycles of the female reproductive system. The cycles are coordinated by the reproductive hormones. The human menstrual cycle refers to the monthly changes that occur to the uterus of the human sexually matured female.
Reason for correct statement:
The hypothalamus secretes the gonadotropin-releasing hormone (GnRH). The GnRH stimulates the anterior lobe of the pituitary to secrete the luteinizing hormone (LH). The LH acts on the ovaries. During the midpoint of the menstrual cycle, the highest level of estrogen occurs. The estrogen induces the LH surge. The high levels of LH induce the completion of meiosis of primary oocyte that was earlier halted. This also causes bursting of the follicle by swelling. Thus, LH surge triggers the ovulation process.
Option c. is given as “LH; pituitary”.
As LH, secreted by the pituitary surge during midcycle triggers ovulation, the correct answer is option c.
Reasons for incorrect statements:
Option a...
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