Endothermy and Thermal Regulation
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Questions and Answers

Which process is responsible for the production of excess heat by futile cycles in the mitochondria?

  • Substrate breakdown and H+ pumping out
  • H+ leak across the inner mitochondrial membrane (correct)
  • H+ return and ATP synthesis
  • Heat wasted

    • What is brown fat specialized for?

  • H+ pumping out
  • Heat production (correct)
  • Substrate breakdown
  • H+ return and ATP synthesis

    • What is the maximal conductance above the UCT?

  • Heat production
  • Heat storage by increasing evaporation
  • Heat loss by evaporation (correct)
  • Heat storage by increasing Tb

    • Which of the following is NOT a method of heat loss above the UCT?

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

    What is the main reason fish are ectotherms?

    <p>They are surrounded by thermally-conductive water</p> Signup and view all the answers

    Which of the following is NOT a reason for regional endothermy in fish?

    <p>Improvements in vision</p> Signup and view all the answers

    What is responsible for retaining heat in a small region in fish?

    <p>Counter-current heat exchanger</p> Signup and view all the answers

    What is the area of the rete mirabile?

    <p>HWA Fig. 10-46</p> Signup and view all the answers

    What is the main purpose of regional endothermy in fish?

    <p>To allow better performance as a predator in colder water</p> Signup and view all the answers

    How many separate occasions did regional endothermy evolve in bony fishes?

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

    Which of the following is true about endothermic homeotherms?

    <p>They have a high and stable body temperature</p> Signup and view all the answers

    What is the equation for power required to maintain a heated object at a set point temperature of 37 °C?

    <p>P = C(Tset - Ta)</p> Signup and view all the answers

    What happens to power required to maintain the set point temperature when insulation is added?

    <p>It reduces conductance and reduces power required</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is 37 °C?

    <p>Power (W) = 0</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is not 37 °C?

    <p>Power (W) = C(Tb - Ta)</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is 37 °C?

    <p>Power (W) = 0</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is not 37 °C?

    <p>Power (W) = C(Tb - Ta)</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is 37 °C?

    <p>Power (W) = 0</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is not 37 °C?

    <p>Power (W) = C(Tb - Ta)</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is 37 °C?

    <p>Power (W) = 0</p> Signup and view all the answers

    What is the equation for power in the physical model when air temperature is not 37 °C?

    <p>Power (W) = C(Tb - Ta)</p> Signup and view all the answers

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