Most land-dwelling invertebrates and all of the amphibians

Most land-dwelling invertebrates and all of the amphibians 

A) are ectothermic organisms with variable body temperatures.
B) alter their metabolic rates to maintain a constant body temperature of 37°C.
C) have a net loss of heat across a moist body surface, even in direct sun.
D) are endotherms but become thermoconformers only when they are in water.
E) become more active when environmental temperatures drop below 15°C.






Answer: A

An example of an organism that has only behavioral controls over its body temperature is the

An example of an organism that has only behavioral controls over its body temperature is the 

A) green frog.
B) penguin.
C) bluefin tuna.
D) house sparrow.
E) gray wolf.





Answer: A

The panting responses that are observed in overheated birds and mammals dissipates excess heat by

The panting responses that are observed in overheated birds and mammals dissipates excess heat by 

A) countercurrent exchange.
B) acclimation.
C) vasoconstriction.
D) hibernation.
E) evaporation.





Answer: E

Endothermy

Endothermy 

A) is a characteristic of most animals found in tropical zones.
B) is a characteristic of animals that have a fairly constant body temperature.
C) is a term equivalent to cold-blooded.
D) is a characteristic of mammals but not of birds.
E) is seen only in insects and in certain predatory fishes.





Answer: B

An overheated and sick dog in a hot environment will have an impaired thermoregulatory response when its

An overheated and sick dog in a hot environment will have an impaired thermoregulatory response when its 

A) evaporative heat loss increases.
B) metabolic heat production decreases.
C) body temperature increases to match the environmental temperature.
D) blood vessels near its skin increase vasoconstriction.
E) behavioral response takes it to a cooler location.






Answer: C

An example of an ectothermic organism that has few or no behavioral options when it comes to its ability to adjust its body temperature is a

An example of an ectothermic organism that has few or no behavioral options when it comes to its ability to adjust its body temperature is a 

A) terrestrial lizard.
B) sea star, a marine invertebrate.
C) bluefin tuna, a predatory fish.
D) hummingbird.
E) honeybee in a hive.






Answer: B