Endothermy and Thermal Regulation

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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?

Sweating (B) Signup and view all the answers

What is the main reason fish are ectotherms?

They are surrounded by thermally-conductive water (B) Signup and view all the answers

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

Improvements in vision (D) Signup and view all the answers

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

Counter-current heat exchanger (A) Signup and view all the answers

What is the area of the rete mirabile?

HWA Fig. 10-46 (C) Signup and view all the answers

What is the main purpose of regional endothermy in fish?

To allow better performance as a predator in colder water (A) Signup and view all the answers

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

Three (A) Signup and view all the answers

Which of the following is true about endothermic homeotherms?

They have a high and stable body temperature (D) 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 = C(Tset - Ta) (C) Signup and view all the answers

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

It reduces conductance and reduces power required (C) Signup and view all the answers

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

Power (W) = 0 (B) Signup and view all the answers

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

Power (W) = C(Tb - Ta) (B) Signup and view all the answers

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

Power (W) = 0 (C) Signup and view all the answers

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

Power (W) = C(Tb - Ta) (A) Signup and view all the answers

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

Power (W) = 0 (C) Signup and view all the answers

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

Power (W) = C(Tb - Ta) (C) Signup and view all the answers

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

Power (W) = 0 (D) Signup and view all the answers

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

Power (W) = C(Tb - Ta) (D) Signup and view all the answers

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?

What is brown fat specialized for?

What is the maximal conductance above the UCT?

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

What is the main reason fish are ectotherms?

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

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

What is the area of the rete mirabile?

What is the main purpose of regional endothermy in fish?

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

Which of the following is true about endothermic homeotherms?

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

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

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

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

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

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

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

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

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

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

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