Critical Thinking Activities - Chapter 20 Answers

  1. The mouse would most likely develop into what appeared to be a male (648).

  2. Anorexia and bulimia would also reduce the body fat percentage thus causing an inhibition of GnRH secretion (650).

  3. The picture on page 659 clearly shows that the urethra and the ejaculatory duct both pass through the prostate. Therefore, if the prostate were to be inflamed and swollen, both tubes would be constricted, reducing function in both.

  4. No: the sperm also includes the centrosome, needed for cell division (675). A more appropriate procedure is explained on page 676.

  5. Progesterone helps to repress gonadotropin production (683)

  6. The oxytocin (i.e. milk-let-down factor) induces milk ejection in the appropriate tissue (687) whether the baby is at that breast or not.


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