GUIDED READING - Ch. 40 - HOMEOSTASIS: THERMOREGULATION
•
NAME: ________________________
Please print out these pages and HANDWRITE the answers directly on the printouts. Typed work or answers on
separate sheets of paper will not be accepted.
•
•
•
•
Importantly, guided readings are NOT GROUP PROJECTS!!! You, and you alone, are to answer the questions as you read.
You are not to share them with another students or work together on filling it out. Please report any dishonest behavior to your instructor to be
dealt with accordingly.
Get in the habit of writing legibly, neatly, and in a NORMAL, MEDIUM-SIZED FONT. AP essay readers and I will skip
grading anything that cannot be easily and quickly read so start perfect your handwriting.
Please SCAN documents properly and upload them to Archie. Avoid taking photographs of or uploading dark, washed out,
side ways, or upside down homework. Please use the scanner in the school’s media lab if one is not at your disposal and keep completed
guides organized in your binder to use as study and review tools.
READ FOR UNDERSTANDING and not merely to complete an assignment. Though all the answers are in your textbook,
you should try to put answers in your own words, maintaining accuracy and the proper use of terminology, rather than blindly copying the
textbook whenever possible.
Feedback control loops maintain the internal environment in many animals. [2]
1. a. Explain the difference between animals that are regulators and those that are conformers. [2]
b. The example in the text is related to temperature regulation. Would ectotherms be regulators or conformers?
[2]
2. a. Throughout the text, a common theme has been regulation of homeostasis by feedback loops. We discuss
feedback loops again as we look at hormone levels. What is meant by a set point? [2]
b. Describe an example of a negative feedback loop. [2]
c.
Clearly define and identify the set point, the stimulus, and the response in your example above. [2]
3. Is it accurate to define homeostasis as a constant internal environment? Explain. [1]
4. We sometimes say that in negative feedback “more gets you less,” and in positive feedback “more gets you
more.” Describe an example of a positive feedback loop and explain why it is a positive feedback loop instead of
a negative one. [2]
Homeostatic processes for thermoregulation involve form, function, and behavior. [2]
5. What is thermoregulation? [2]
6. Describe the difference between endothermy and ectothermy, and give an animal that exhibits each. [2]
7. What are the four processes by which heat is exchanged with the environment? Use this figure to name and
explain each process. [2]
8. What mode of heat exchange is involved in “wind chill,” when moving air feels colder than still air at the same
temperature? [1]
9. Discuss how each of the following are involved in thermoregulation: [2]
fur/feathers
adipose tissue
goose bumps
vasodilation/vasoconstriction
panting/sweating
burrowing/sunning
10. Heat loss in extremities is reduced by countercurrent exchange. Use this figure to explain how countercurrent
exchange works. [2]
11. What is the role of the hypothalamus in temperature regulation? [2]
Energy requirements are related to animal size, activity, and environment. [2]
12. a.
What is the metabolic rate? [2]
b. In what units is it usually measured? [2]
13. a. What is basal metabolic rate (BMR)? [2]
b. What is the relationship between BMR and body mass? [2]
14. a. What are torpor and hibernation?
b. What are the evolutionary advantages of torpor and hibernation? [2]
15. If a mouse and a small lizard of the same mass (both at rest) were placed in experimental chambers under
identical environmental conditions, which animal would consume oxygen at a higher rate? Explain. [1]
16. Please answer the Self-Quiz at the end of your chapter. Do your best to try it from memory first in order to
test how well you grasped the material.
1. ______
2. ______
3. ______
4. ______
5. ______
References
1.
Campbell et al. (2008). AP* Edition Biology. 8th Ed. San Francisco: Pearson Benjamin Cummings.
2.
Adapted from Fred and Theresa Holtzclaw
6. _______