Endothermy and Thermal Regulation

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Which of the following is an example of non-shivering thermogenesis?

The production of excess heat by futile cycles

The H+ leak across the inner mitochondrial membrane mediated by uncoupling proteins (correct)

The breakdown of substrate and pumping out of H+

The synthesis of ATP

What is the specialized type of fat that is involved in non-shivering thermogenesis?

White fat

Brown fat (correct)

Visceral fat

Subcutaneous fat

What is the maximal conductance level at and above which excess heat can be stored or lost?

H+

ATP

UCT (correct)

ETC

Which of the following is a method of heat loss in animals?

Evaporation by sweating, licking, panting, gular flutter Signup and view all the answers

What is the function of fish gills in terms of heat?

Act as a heat sink Signup and view all the answers

Which of the following is an example of regional endothermy in fish?

Temperature gradients in tuna Signup and view all the answers

What is the purpose of regional endothermy in fish?

To allow long migration through water of different temperatures Signup and view all the answers

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

Three Signup and view all the answers

Why do fish have problems keeping heat?

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

What is the main factor that limits the ability of fish to generate and retain heat?

Thermally-conductive water Signup and view all the answers

Which of the following is true about endothermic homeotherms?

They have a high and stable body temperature 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) Signup and view all the answers

How does insulation affect the power required to maintain the set point temperature?

Insulation reduces power required Signup and view all the answers

What is the equation for power in the physical model when considering endothermic homeotherms?

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

What is the Scholander Curve?

A curve that represents the relationship between metabolic rate and air temperature Signup and view all the answers

What are vasomotor responses?

Responses that involve changes in conductance due to vasodilation and vasoconstriction Signup and view all the answers

What is pilomotor or ptilomotor response?

A response that involves changes in metabolic rate due to changes in posture Signup and view all the answers

What is regional heterothermy?

A method of heat exchange in endothermic homeotherms Signup and view all the answers

What is the main difference in thermal conductance between cold adapted animals and tropical animals?

Cold adapted animals have lower thermal conductance Signup and view all the answers

How can seasonal acclimatization to cold tolerance be achieved?

Through changes in pelage and metabolic adjustment Signup and view all the answers