Which of the following is not initiated at puberty? QID: 4176137 Mark For Review Pulsatile release of gonadotropins Diminished production of luteinizing hormone Gonadal secretion of sex steroids Gametogenesis
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- Pulsatile release of gonadotropins (LH and FSH) begins at puberty to stimulate the gonads. - Gonadal secretion of sex steroids (estrogen and testosterone) increases at puberty. - Gametogenesis (production of sperm or ova) is activated at puberty. Show more…
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Spermatogenesis starts at puberty due to the secretion of (a) Luteinizing hormone (b) Gonadotropin releasing hormone (c) Follicle stimulating Hormone (d) Testosterone
Spermatogenesis begins with the mitotic division of primordial germ cells to form primary spermatocytes. These primary spermatocytes undergo meiosis I to produce secondary spermatocytes. Each secondary spermatocyte then undergoes meiosis II to form four haploid spermatids. Which of the following would likely occur if one were to have decreased amounts of inhibin? FSH secretion would selectively inhibit LH secretion. Spermatogenesis would be depressed, but testosterone secretion would remain normal. Sperm cell production would be enhanced due to increased production of interstitial cells. Menstrual cycles refer to the changes in hormone levels that occur in the average woman. The average menstrual cycle lasts about 28 days. All of the above choices are correct. The mature ovarian follicles are fertilized after ovulation. This promotes the maturation of the oocyte. The LH surge, which is caused by ovulation, results in the secretion of estrogen. Estrogen stimulates the thickening of the endometrium and culminates with the second meiotic division of the egg. All of the above choices are correct. Greater secretion of estrogen from the follicle is due to the two-cell mechanism. The granulosa cells synthesize androgen, which is converted to estrogen by the theca cells. The granulosa cells also synthesize dihydrotestosterone. The production of progesterone by the corpus luteum requires cooperative interaction between the granulosa and theca cells. All of the above choices are correct. The phases of the uterine cycle are the menstrual phase, proliferative phase, secretory phase, and the last half of the proliferative phase. The follicular phase of the ovarian cycle coincides with the menstrual phase and the first half of the proliferative phase. LH levels will be low during the menstrual phase and rise near the end of the proliferative phase. Estrogen levels in the blood are low during the menstrual phase, relatively high during the proliferative phase, and at or near peak levels during the secretory phase.
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The direct trigger to ovulation seems to be a A. Sharp increase in progesterone production on approximately day 13 of the menstrual cycle. B. Sharp increase in FSH production on approximately day 13 of the menstrual cycle. C. Sharp increase in LH production on approximately day 13 of the menstrual cycle. D. Release of gonadotropin hormone from the follicle. E. Sharp increase in prolactin production on approximately day 13 of the menstrual cycle. QUESTION 10 Which of the following statements concerning hormonal regulation is correct? A. A hormone does not inhibit its own release. B. The substrate a hormone regulates does not affect that hormone release. C. Negative feedback regulation occurs only at the level of the anterior pituitary. D. Feedback inhibition may be exerted by nutrients and hormones.
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