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Student Center Anatomy and Physiology, Second Edition
The unity of form and function
Kenneth S. Saladin
Student Center

Chapter 27: The Male Reproductive System

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 Comprehension Test
  1. Explain why testosterone may be considered both an endocrine and paracrine secretion of the testes. (Review paracrines in chapter 17 if necessary).
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  2. A young man is in a motorcycle accident that severs his spinal cord at the neck, leaving him paralyzed from the neck down. When informed of the situation, his wife asks the physician if her husband will be able to have erections and father any children. What should the doctor tell her? Explain your answer.
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  3. Considering the temperature in the scrotum, would you expect hemoglobin to unload more oxygen to the testes, or less, than it unloads in the warmer internal organs? Why? (Hint: see figure 22.24.) How would you expect this fact to influence sperm development?
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  4. Why is it possible for spermatogonia to be outside the blood-testis barrier, yet necessary for primary spermatocytes and later stages to be within the barrier, isolated from the blood? .
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  5. A 68-year-old man taking medication for hypertension complains to his physician that it has made him impotent. Explain why this could be an effect of antihypertension drugs.
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