20.9–20.13: How does homeostasis work?

For animals to maintain homeostasis with regard to a particular physiological variable, that variable must have a set point to which the organism can return.

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Question 20.28

It is not necessarily accurate to refer to endotherms as “warm-blooded,” because:

  • a) some endotherms allow their body temperature to drop significantly during hibernation.
  • b) on average, their body temperature is colder than that of “cold-blooded” animals.
  • c) they generate their heat primarily within their own bodies.
  • d) most do not actually have blood in their bodies.
  • e) some are homeotherms rather than heterotherms.

Question 20.29

The glomerulus is _______ that is/are a key component of the filtration process in the nephron.

  • a) a system of ducts
  • b) a renal tubule
  • c) a layer of connective tissue
  • d) the terminal end of the nephron
  • e) a bed of capillaries

Question 20.30

In homeostasis terms, a fever is classified as:

  • a) a rise in internal temperature in response to foreign invaders.
  • b) a sudden drop in internal temperature.
  • c) a crazed reaction toward some object.
  • d) any general rise in internal temperature.
  • e) All of the above are correct.