THERMOREGULATION HW
AP BIOLOGY
DR WEINER
Multiple choice (5 pt)
1. An overheated and sick dog has an impaired thermoregulatory response if it
a. increases its evaporative heat loss.
b. decreases its metabolic heat production.
c. increases its body temperature to match the environmental temperature.
d. increases its vasodilation in blood vessels near the skin.
e. relocates itself to a cooler location.
2. Panting observed in overheated birds and mammals dissipates excess heat by
a. countercurrent exchange.
b. acclimation.
c. vasoconstriction.
d. hibernation.
e. evaporation.
3. The temperature-regulating center of vertebrate animals is located in the
a. medulla oblongata.
b. thyroid gland.
c. hypothalamus.
d. subcutaneous layer of the skin.
e. liver.
4. Panting by an overheated dog is an example of
a. acclimatization.
b. torpor.
c. evaporative cooling.
d. non-shivering thermogenesis.
e. shivering thermogenesis.
5. Metabolism of specialized brown fat depots in certain animals is substantially increased during
a. acclimatization.
b. torpor.
c. evaporative cooling.
d. non-shivering thermogenesis.
e. shivering thermogenesis.
6. The cooling effect of perspiring helps organisms maintain a steady body temperature. Which of
the following best explains this phenomenon?
a. Water has a high heat of vaporization
b. Strong hydrophobic interactions exist between water molecules
c. Little kinetic energy is required to break hydrogen bonds between water molecules
d. Water is less dense as it increases in temperature
e. The oxygen-hydrogen bonds within water molecules are difficult to break
7. Physiological adjustments by an ectotherm to cooler seasonal temperatures may include
a. An increase in metabolic rate
b. Changes in lipid composition of the cell membrane
c. Increased vasoconstriction of surface capillaries
d. Increased skeletal muscle contractions
e. All of the above
8. The key difference between endotherms and ectotherms is
a. Ectotherms mainly generate heat from fermentation
b. All Ectotherms are aquatic and all endotherms are terrestrial
c. Endotherms are cold blooded animals whose body temperature cannot reach that of
endotherms
d. All ectotherms are invertebrates and all endotherms are vertebrates
e. Ectotherms use the environment to warm their bodies while endotherms use internal
mechanisms to warm their bodies.
9. Body temperature can be increased by all of the following EXCEPT
a. Muscle contraction
b. Drinking alcohol which results in vasodilation
c. Increasing metabolic activity
d. Reducing blood flow to the ears
e. All increase body temperature
10. The cooling effect of perspiring helps organisms maintain a steady body temperature. Which of
the following best explains this phenomenon?
a. Water has a high heat of vaporization
b. Strong hydrophobic interactions exist between water molecules
c. Little kinetic energy is required to break hydrogen bonds between water molecules
d. Water is less dense as it increases in temperature
e. The oxygen-hydrogen bonds within water molecules are difficult to break
11. Physiological adjustments by an ectotherm to cooler seasonal temperatures may include
a. An increase in metabolic rate
b. Changes in lipid composition of the cell membrane
c. Increased vasoconstriction of surface capillaries
d. Increased skeletal muscle contractions
e. All of the above
12. The key difference between endotherms and ectotherms is
a. Ectotherms mainly generate heat from fermentation
b. All Ectotherms are aquatic and all endotherms are terrestrial
c. Endotherms are cold blooded animals whose body temperature cannot reach that of
endotherms
d. All ectotherms are invertebrates and all endotherms are vertebrates
e. Ectotherms use the environment to warm their bodies while endotherms use internal
mechanisms to warm their bodies.
body temp celcius
13. Mice are mammals. As such, they are endotherms. They maintain internal heat metabolically.
A lizard is an ectotherm and gains body heat from the environment. Which of the following
graphs most accurately depicts the situation?
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30
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mouse
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environmental temp celcius
a.
body temp
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environmental temp
b.
body temp
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mouse
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environmental temp
c.
body temp
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mouse
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environmental temp
d.
Essay (10 pt)
1. Explain how negative feedback regulates body temperature
2. Regulation and homeostasis are key to living things
a. Explain what a feedback mechanisms is and how it helps an organism maintain
homeostasis
b. Explain the difference between positive feedback and negative feedback
3. Maintaining population size is a feedback mechanism. Explain.