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| 1 | |
If an adult male were castrated, what would happen to the levels of GnRH, FSH, LH, and testosterone in his blood? What effect would these hormonal changes have on sexual characteristics and behavior? |
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| 2 | |
If a 9-year-old boy were castrated, what would happen to the levels of GnRH, FSH, LH, and testosterone in his blood? What effect would these hormonal changes have on sexual characteristics and behavior? |
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| 3 | |
Suppose you want to produce a birth-control pill for men. On the basis of what you know about the male hormone system, what do you want the pill to do? Discuss any possible side effects that could be produced by your pill. |
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| 4 | |
If the ovaries are removed from a postmenopausal woman, what happens to the levels of GnRH, FSH, LH, estrogen, and progesterone in her blood? What symptoms do you expect to observe? |
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| 5 | |
During the secretory phase of the menstrual cycle, you normally expect
- the highest levels of progesterone that occur during the menstrual cycle.
- a follicle present in the ovary that is ready to undergo ovulation.
- that the endometrium reaches its greatest degree of development.
- both a and b.
- both a and c.
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| 6 | |
If the ovaries are removed from a 20-year-old female, what happens to the levels of GnRH, FSH, LH, estrogen, and progesterone in her blood? What side effects do these hormonal changes have on her sexual characteristics and behavior? |
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| 7 | |
A study divides healthy adult females into two groups (A and B). Both groups are composed of females who have been sexually active for at least 2 years and are not pregnant at the beginning of the experiment. The subjects weigh about the same amount, and none smokes cigarettes, although some do drink alcohol occasionally. Group A women receive a placebo in the form of a sugar pill each morning during their menstrual cycles. Group B women receive a pill containing estrogen and progesterone each morning of their menstrual cycles. Then plasma LH levels are measured before, during, and after ovulation. The results are as follows:
| | 4 Days Before | The Day of | 4 Days After | | Group | Ovulation | Ovulation | Ovulation | | A | 18 mg/100 mL | 300 mg/100 mL | 17 mg/100 mL | | B | 21 mg/100 mL | 157 mg/100 mL | 15 mg/100 mL |
The number of pregnancies in group A was 37/100 females/year. The number of pregnancies in group B was 1.5/100 females/year. What conclusion can you reach on the basis of these data? Explain the mechanism involved. |
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| 8 | |
A woman who is taking birth-control pills that consist of only progesterone experiences the hot flash symptoms of menopause. Explain why. |
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| 9 | |
GnRH can be used to treat some women who want to have children but have not been able to get pregnant. Explain why it's critical to administer the correct concentration of GnRH at the right time during the menstrual cycle. |
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