Metabolic Rate and Acclimation in Ectotherms Quiz
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Questions and Answers

What type of relationship can be seen between ectotherms and their environment?

  • Acute responses only
  • Chronic responses only
  • Evolutionary responses only
  • All of the above (correct)
  • Which factor influences the metabolic rate of cold-acclimated fish?

  • Increased number of mitochondria
  • Unchanged electron transport chain enzymes
  • Decreased enzyme activity
  • Altered Krebs cycle enzymes (correct)
  • In endothermy, what does the thermoneutral zone (TNZ) represent?

  • Range of temperatures where body temperature remains constant (correct)
  • Range of temperatures where metabolic rate decreases
  • Range of temperatures where animals hibernate
  • Range of temperatures where heat transfer stops
  • What is the consequence when the animal's body temperature is higher than the ambient temperature?

    <p>Heat moves out of the animal's body</p> Signup and view all the answers

    What is a characteristic of homeothermy in terms of physiological adaptations?

    <p>Metabolism changing with changes in body temperature</p> Signup and view all the answers

    Which group shows an evolutionary adaptation in response to environmental changes?

    <p>Both ectotherms and endotherms</p> Signup and view all the answers

    What is the term for an animal that relies on metabolic production of heat to warm its tissues?

    <p>Endotherm</p> Signup and view all the answers

    Which term describes an animal whose body temperature is determined by external conditions?

    <p>Poikilotherm</p> Signup and view all the answers

    What is the mechanism by which an organism maintains a relatively constant tissue temperature called?

    <p>Thermoregulation</p> Signup and view all the answers

    Which of the following terms best describes the regional differences in body temperatures within a single individual?

    <p>Heterothermy</p> Signup and view all the answers

    What do we call the process where an organism adjusts its metabolic rate to compensate for changes in temperature?

    <p>Metabolic compensation</p> Signup and view all the answers

    Which term best describes an animal that thermoregulates by physiological means rather than relying on external conditions?

    <p>Endotherm</p> Signup and view all the answers

    What is the formula for heat production in animals to prevent heat loss?

    <p>M = C(TB - TA)</p> Signup and view all the answers

    What is the term for the resistance to dry heat loss often referred to as insulation?

    <p>Resistance</p> Signup and view all the answers

    In cold environments, what happens to the metabolic rate of animals as ambient temperature decreases?

    <p>It increases</p> Signup and view all the answers

    Which physiological adaptation becomes maximized in animals when exposed to temperatures below their thermal neutral zone (TNZ)?

    <p>Insulation</p> Signup and view all the answers

    Which of the following does NOT play a role in nonshivering thermogenesis in mammals?

    <p>Use of hydrogens in electron transport chain (ETC)</p> Signup and view all the answers

    What physiological process enables heat conservation in animals by cooling appendages to limit overall heat loss?

    <p>Countercurrent heat exchange</p> Signup and view all the answers

    Which of the following is a form of insulation utilized by animals to regulate their body temperature?

    <p><strong>Feathers</strong></p> Signup and view all the answers

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