...is one in which it uses internal mechanisms to control internal change in the face external fluctuation. (an otter regulates body temp independently of exterior cold water). -Homeostatic conformer is one in which the organism if it allows an external influence the internal conditions of the organism. (Bass fish conforms to the temp of the lake that it inhibits) 2. In your own words, provide a definition for poikioltherm, homeotherm, ectotherm and endotherm. Provide an example of an animal for each of the following combinations and explain why it fits these terms: - Poikioltherm: An animals whose body temp varies with the surrounding temperature -Homeotherm: An organism such as a bird or mammal, having a body temp that is constant and largely independent of the temperature surrounding. -Ectotherm- heat acquired from external environment -Endotherm- heat generated by metabolism Poikilotherm & ectotherm: Fish, amphibians, reptiles. Poikilotherm & endotherm: Mammals and birds, insects Homeotherm & ectotherm: tropical reptiles Homeotherm & endotherm: Mostly birds and mammals 3. Describe the 4 mechanisms through which animals exchange heat with their environments. -Radiation: Release of electromagnetic waves by all objects warmer than absolute zero. -Convection: Transfer of heat by movement. Warm blood from core moves to extremities. -Conduction: Direct transfer to thermal motion between molecules of objects in contact with each other. -Evaporation:...
Words: 2439 - Pages: 10
...their flight muscles and: A. using their blood as a coolant. B. decreasing their metabolic rate. C. possessing an internal respiratory system. D. using a countercurrent heat exchange mechanism. Question 2 The thermal stability of aquatic environments is a result of the: A. high specific heat of water. B. low latent heat of vaporization of water. C. low latent heat of fusion of water. D. All of the choices are correct. Question 3 Animals that rely mainly on external sources of energy for regulating body temperature are called: A. epitherms. B. endotherms. C. ectotherms. D. peritherms. Question 4 In general, reptiles are considered to be a/an: A. poikilotherm. B. homeotherm. C. endotherm. D. heterotherm. Question 5 Mammalian and avian aquatic endotherms use all of the following mechanisms to thermoregulate EXCEPT: A. fat. B. internal respiratory systems. C. fur or feathers. D. concurrent heat exchange. Question 6 The water availability for organisms is determined by: A. internal dissolved ion concentrations. B. external dissolved ion concentrations. C. movement of water down its concentration gradient. D. movement of water up its concentration gradient. Question 7 Aquatic organisms whose ionic concentration of their body fluids exceed that of their surroundings are: A. hyperosmotic. B. hypoosmotic. C. isoosmotic...
Words: 5231 - Pages: 21
