Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 50, Problem 5TYK
Summary Introduction
To review:
The pituitary hormones involved in regulating the human menstrual cycle.
Introduction:
Menstrual cycle is the reproductive cycle occurring in females at the onset of puberty leading to heavy discharge of blood due to hormonal concentration changes and shedding of endometrium layer lined in female uterus. Pituitary hormones LH and FSH, and ovarian hormones such as progesterone interaction leads to menstrual cycle.
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Chapter 50 Solutions
Biological Science
Ch. 50 - Prob. 1TYKCh. 50 - Prob. 2TYKCh. 50 - Prob. 3TYKCh. 50 - Prob. 6TYKCh. 50 - Prob. 4TYKCh. 50 - 8. Summarize the experimental evidence that...Ch. 50 - Prob. 5TYKCh. 50 - Prob. 7TYUCh. 50 - 8. Give examples of negative feedback and positive...Ch. 50 - Contrast spermatogenesis with oogenesis in humans....
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- At what time in the menstrual cycle is the level of thefollowing hormones high, and what is the effect of thiselevation? (1) LH, (2) progesterone, (3) estrogen, and(4) FSHarrow_forwardHow do levels of hormone vary in the different phases of the menstrual cycle? Explain each hormone.arrow_forwardWhat role does pituitary gonadotrophins play during follicular and ovulatory phases of menstrual cycle and also explain the shift steroidal secretions.arrow_forward
- In menstruation, the functional layer is shed from the endometrium. Explain the hormonal and physical factors responsible for this shedding. (See Figure 25.19.)arrow_forwardIf the ovum is not fertilized, the corpus luteum regresses, and the endometrium sloughs off to result in the first day of menstrual bleeding. The latter event would be duplicated, even if fertilization occurred, if receptors for which of the following hormones were occupied by an antagonist? A) Dehydroepiandrosterone B) Estradiol C ) Estriol D) Estrone E) Progesteronearrow_forwardWhy does the body temperature increase during the second half of the menstrual cycle?arrow_forward
- What are the organizing effects of sex hormones? Compare the negative feedback loops in the male reproductive system with those of the female’s reproductive cycle. Describe an example of positive feedback involving estrogen that leads to ovulation. What are the hormonal changes during the luteal phase of the menstrual cycle?arrow_forwardwhich hormone is capable of negative and psitive feedback effects on the pituitary gland during the normal menstrual cycle ?arrow_forwardWhich of the following is NOT TRUE? A) Menopause is marked by elevated levels of gonadotropins. A spermatozoon can survive for more than five days in a female reproductive tract. C) The proliferative endometrial phase is promoted by progesterone. Synthetic estrogens act as contraceptives by preventing the ovarian luteal phase. The hormonal basis of stress-induced amenorrhea is due to the influence of the limbic system on GNRH secretion.arrow_forward
- Why does FSH concentration increase and remain increased during menopause?arrow_forwardWhat is the menstrual cycle? Name the Hormones which control the menstrual cycle.arrow_forwardDiscuss the hypothalamic-pitiutary-ovarian and the physiologic basis for the interplay of the various hormones involved in the axis.arrow_forward
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