Question 1

Which type of animal is the least likely to have a body temperature different from the environment?

Accepted Answer

Fish are ectothermic animals, meaning they have a body temperature that is typically the same as the environment around them. Sparrows, chipmunks, and lizards are all warm-blooded animals and have the ability to regulate their body temperature internally. Honey bees are also able to generate heat and maintain a consistent temperature within their hive, making them less likely to have a body temperature similar to their environment. However, of the given choices, fish are the least likely to have a body temperature different from their environment.

Question 2

Refer to the graph showing the body temperatures of different types of organisms in the same environmental temperatures.  The reaction of a mouse to different environmental temperatures is represented by the curve labeled _______.When the mouse is at the environmental temperature marked by an X on the x axis, the mouse might _______.

Accepted Answer

The answer of Refer to the graph showing the body...

Question 3

Heat exchange between the internal environment and the skin occurs

Accepted Answer

Heat exchange between the internal environment and the skin occurs in both ectotherms and endotherms through blood flow. In ectotherms, heat exchange also occurs through other means, such as behavior and external surfaces, but blood flow is the main mechanism in both ectotherms and endotherms.

Question 4

Refer to the graph showing the body temperatures of different types of organisms in the same environmental temperatures.  The reaction of a lizard to different environmental temperatures is represented by the curve labeled _______.When the lizard is at the environmental temperature marked by an asterisk (*) on the x axis, the lizard might _______.

Accepted Answer

The answer of Refer to the graph showing the body...

Question 5

During the day, hummingbirds maintain a high, constant body temperature, but at night they can lower their metabolism to save energy and allow their body temperatures to fall by as much as 20°C.Hummingbirds are therefore

Accepted Answer

Hummingbirds are able to lower their metabolism and allow their body temperatures to fall significantly at night, which is a characteristic of heterothermic animals. They are not ectothermic (reliant on external sources to regulate body temperature) or pyrothermic (reliant on heat production from metabolism) as they can maintain a high body temperature during the day. Varitherms is not a term used to describe animal thermoregulation.

Question 6

Organisms that depend largely on external sources of heat to maintain body temperature are called

Accepted Answer

Organisms that depend largely on external sources of heat to maintain body temperature are called ectothermic. Ectothermic animals cannot regulate their body temperature internally like endothermic animals do, and instead rely on behavioral adaptations such as basking in the sun or seeking shade. Examples of ectothermic animals include reptiles, amphibians, and most fish.

Question 7

Which animal is an endotherm?

Accepted Answer

Eagles are endotherms, meaning they maintain a constant body temperature internally through metabolic processes, unlike ectotherms which rely on external sources of heat.

Question 8

An ectotherm's metabolism adjusts to compensate for seasonal thermal changes.This is most likely made possible by the production of different

Accepted Answer

Isozymes with temperature optima matching the season would allow an ectotherm's metabolism to adjust to compensate for seasonal thermal changes. This means that different forms of enzymes would be used in different seasons, allowing for optimal metabolic activity at different temperatures.

Answer: A, E
 Thermogenins and adipose tissue are more likely to be associated with endotherms, or warm-blooded animals, as they play a role in generating and conserving body heat. Countercurrent exchangers are also more commonly found in endotherms. Thermoneutral zones are the range of temperatures at which an animal does not need to expend energy to maintain its body temperature, and while this is relevant for ectotherms, it does not directly relate to how their metabolism adjusts to seasonal temperature changes.

Question 9

Refer to the graph showing how different types of organisms respond to changes in environmental temperature.  The curve labeled _______ is appropriate for a lizard, and the curve labeled _______ is appropriate for a mouse.As the environmental temperature these animals are subjected to rises from 10°C to 20°C, the metabolic rate of the lizard _______ and the metabolic rate of the mouse _______.

Accepted Answer

The answer of Refer to the graph showing how different...

Question 10

Organisms that sometimes regulate their own internal temperature but sometimes allow their temperature to be determined by the environment are called

Accepted Answer

Organisms that sometimes regulate their own internal temperature but sometimes allow their temperature to be determined by the environment are called heterotherms. Ectotherms rely on external sources of heat to regulate their temperature, while endotherms rely on internal metabolism to regulate their temperature. Varitherms and pyrotherms are not commonly used terms in biology.

Question 11

"Hot" fish pick up their heat

Accepted Answer

"Hot" fish, such as certain species of tuna and sharks, generate heat through metabolically active muscles, particularly those associated with swimming. This endothermic capability allows them to maintain body temperatures higher than the surrounding water, enhancing their metabolic efficiency and performance.

Question 12

Some bats maintain their internal temperatures metabolically during spring and summer but hibernate in large groups during the winter.They therefore can be considered

Accepted Answer

Heterotherms are animals that can regulate their body temperature to some extent but can also allow their body temperature to vary depending on the external environment. Bats that maintain their internal temperatures metabolically during spring and summer but hibernate in large groups during the winter are able to maintain a relatively constant body temperature during active periods, but allow their body temperature to drop significantly during hibernation. This makes them heterotherms. Endotherms, such as mammals and birds, maintain a constant internal body temperature regardless of the environment. Ectotherms, such as reptiles and amphibians, rely on external heat sources to regulate their body temperature. Pyrotherms and varitherms are not commonly used terms in biology.

Question 13

Which of the following is the biggest difference between a "cold" fish, such as a trout, and a "hot" fish, such as a tuna, relative to their thermoregulation?

Accepted Answer

The answer of Which of the following is the biggest...

Question 14

As the environmental temperature in a closed chamber containing an endotherm such as a mouse or an ectotherm such as a lizard increases (from 15°C up to 25°C), the metabolic rate of the lizard _______, and that of the mouse _______.

Accepted Answer

As the environmental temperature increases, an ectotherm like a lizard will have an increased metabolic rate because its body temperature and metabolic processes are directly influenced by the external temperature. In contrast, an endotherm like a mouse maintains a constant body temperature through metabolic processes. As the temperature increases, the mouse's metabolic rate decreases because it needs to expend less energy to maintain its body temperature.

Question 15

A squirrel that metabolically maintains its internal temperature during the summer but hibernates during the winter is a(n)

Accepted Answer

This squirrel is exhibiting characteristics of both endothermy (maintaining internal body temperature during summer) and heterothermy (hibernating during winter to conserve energy and allow body temperature to fluctuate with external temperature). Endotherms maintain a constant internal body temperature through metabolic heat production, while heterotherms have the ability to vary their body temperature to match their surroundings. Therefore, the squirrel is a heterotherm.

Question 16

Researchers have found that king penguin chicks can drop the temperature of their internal organs by more than 15°C but then maintain the lower temperature metabolically.These birds can therefore be characterized as

Accepted Answer

King penguin chicks are considered heterothermic, meaning they can actively regulate their body temperature and enter a hibernation-like state where their temperature drops significantly but they are still considered endothermic (warm-blooded). This is different from ectothermic animals, which cannot regulate their internal body temperature and rely on external sources of heat to warm themselves. The terms varitherm and pyrotherm are not commonly used in biology and do not apply to this situation.

Question 17

Which statement about heat exchange is true?

Accepted Answer

Convection is the transfer of heat by the movement of fluids (such as air or water). When animals are exposed to wind with a temperature below that of their body surface, they can lose heat by convection.

Note: A is incorrect because conduction is the direct transfer of heat between two objects that are at different temperatures. B is incorrect because evaporation of sweat from the surface of the body actually cools the body, rather than warming it. C is incorrect because both ectotherms and endotherms can change the rate of heat exchange between their bodies and the external environment by changing blood flow to the skin. E is incorrect because warm blood passing close to cooler blood does not pick up energy from the cooler blood, as both bloods are at the same temperature.

Question 18

Which physiological control mechanism in marine iguanas decreases the iguanas' heat loss when in the water?

Accepted Answer

Decreased blood flow to the skin helps reduce heat loss in marine iguanas when in the water because it minimizes the temperature gradient between the skin and the surrounding water, thereby reducing the loss of heat to the water. This allows the iguanas to maintain their body temperature and conserve energy while swimming in the cold water.

Question 19

A lizard lives in a temperate desert environment where the temperature is cold at night and warm during the day.In order for the lizard to maintain the most stable body temperature, it would most likely

Accepted Answer

By staying in a burrow during the night, the lizard is protected from the cold temperatures. By shuttling between the sun and shade during the day, the lizard can regulate its body temperature to stay within its optimal range. This behavior is known as behavioral thermoregulation. Choice B would expose the lizard to the cold temperatures at night and the hot temperatures during the day. Choices C, D, and E all suggest that the lizard can regulate its body temperature through changes in metabolism, but do not take into account the temperature fluctuations of the environment. Therefore, A is the best choice.

Question 20

In response to a 10°C rise in environmental temperature, an endotherm's body temperature will

Accepted Answer

Endotherms regulate their body temperature internally, allowing it to remain relatively constant despite changes in environmental temperature.

Quiz 39: Physiology, Homeostasis, and Temperature Regulation

Which type of animal is the least likely to have a body temperature different from the environment?

Heat exchange between the internal environment and the skin occurs

During the day, hummingbirds maintain a high, constant body temperature, but at night they can lower their metabolism to save energy and allow their body temperatures to fall by as much as 20°C.Hummingbirds are therefore

Organisms that depend largely on external sources of heat to maintain body temperature are called

Which animal is an endotherm?

An ectotherm's metabolism adjusts to compensate for seasonal thermal changes.This is most likely made possible by the production of different

Organisms that sometimes regulate their own internal temperature but sometimes allow their temperature to be determined by the environment are called

"Hot" fish pick up their heat

Some bats maintain their internal temperatures metabolically during spring and summer but hibernate in large groups during the winter.They therefore can be considered

Which of the following is the biggest difference between a "cold" fish, such as a trout, and a "hot" fish, such as a tuna, relative to their thermoregulation?

As the environmental temperature in a closed chamber containing an endotherm such as a mouse or an ectotherm such as a lizard increases (from 15°C up to 25°C) , the metabolic rate of the lizard _, and that of the mouse _.

A squirrel that metabolically maintains its internal temperature during the summer but hibernates during the winter is a(n)

Researchers have found that king penguin chicks can drop the temperature of their internal organs by more than 15°C but then maintain the lower temperature metabolically.These birds can therefore be characterized as

Which statement about heat exchange is true?

Which physiological control mechanism in marine iguanas decreases the iguanas' heat loss when in the water?

A lizard lives in a temperate desert environment where the temperature is cold at night and warm during the day.In order for the lizard to maintain the most stable body temperature, it would most likely

In response to a 10°C rise in environmental temperature, an endotherm's body temperature will

Quiz 39: Physiology, Homeostasis, and Temperature Regulation

Which type of animal is the least likely to have a body temperature different from the environment?

Heat exchange between the internal environment and the skin occurs

During the day, hummingbirds maintain a high, constant body temperature, but at night they can lower their metabolism to save energy and allow their body temperatures to fall by as much as 20°C.Hummingbirds are therefore

Organisms that depend largely on external sources of heat to maintain body temperature are called

Which animal is an endotherm?

An ectotherm's metabolism adjusts to compensate for seasonal thermal changes.This is most likely made possible by the production of different

Organisms that sometimes regulate their own internal temperature but sometimes allow their temperature to be determined by the environment are called

"Hot" fish pick up their heat

Some bats maintain their internal temperatures metabolically during spring and summer but hibernate in large groups during the winter.They therefore can be considered

Which of the following is the biggest difference between a "cold" fish, such as a trout, and a "hot" fish, such as a tuna, relative to their thermoregulation?

As the environmental temperature in a closed chamber containing an endotherm such as a mouse or an ectotherm such as a lizard increases (from 15°C up to 25°C) , the metabolic rate of the lizard _______, and that of the mouse _______.

A squirrel that metabolically maintains its internal temperature during the summer but hibernates during the winter is a(n)

Researchers have found that king penguin chicks can drop the temperature of their internal organs by more than 15°C but then maintain the lower temperature metabolically.These birds can therefore be characterized as

Which statement about heat exchange is true?

Which physiological control mechanism in marine iguanas decreases the iguanas' heat loss when in the water?

A lizard lives in a temperate desert environment where the temperature is cold at night and warm during the day.In order for the lizard to maintain the most stable body temperature, it would most likely

In response to a 10°C rise in environmental temperature, an endotherm's body temperature will

As the environmental temperature in a closed chamber containing an endotherm such as a mouse or an ectotherm such as a lizard increases (from 15°C up to 25°C) , the metabolic rate of the lizard _, and that of the mouse _.