Question 1

Evaporative cooling is an effective way to increase heat loss, but it carries the physiological drawback of

Accepted Answer

Evaporative cooling requires the use of ATP to produce sweat, and the water lost through sweat can lead to dehydration if not replaced. Therefore, the physiological drawback of evaporative cooling is an increased use of ATP and substantial water loss.

Question 2

In fast-swimming cool-water fishes such as sharks and tunas, which of the following contribute(s) to the generation and maintenance of core body temperatures in excess of ambient water temperatures?

Accepted Answer

Fast-swimming cool-water fishes like sharks and tunas have specialized blood vessels, known as countercurrent heat exchangers, which help retain heat generated by muscle activity, maintaining a core body temperature higher than the surrounding water.

Question 3

Use the following to answer questions: Refer to the graph below. -In the experiment graphed above, the same fish were caught and brought into the lab in both winter and summer. Their metabolic rates (O₂ consumption) were measured at the pond temperatures for each season ($\leftrightarrow$) and at other temperatures ('). This experiment demonstrates the phenomenon of

Accepted Answer

The experiment demonstrated acclimatization, which is the ability of an organism to adjust to changes in its environment, in this case, the fish adjusting their metabolic rates to the different temperatures in winter and summer. The other options are not applicable to this experiment.

Question 4

Which of the following organ systems is not involved in the maintenance of homeostasis in humans?

Accepted Answer

The answer of Which of the following organ systems is...

Question 5

Some animals use brown fat as a source of heat generation. Which of the following statements about brown fat is false?

Accepted Answer

Brown fat cells actually contain a high number of mitochondria, which are responsible for the thermogenesis process.

Question 6

On a hot day, an active dog will pant heavily and visit his water bowl frequently. Which of the following statements about the dog's condition or behavior is false?

Accepted Answer

The dog is not operating at a basal metabolic rate because he is adjusting his behavior to thermoregulate, such as visiting his water bowl frequently and panting heavily. Basal metabolic rate refers to the minimum amount of energy required to maintain vital functions while at rest.

Question 7

During childbirth, the pressure exerted on the mother's cervix by the emerging infant leads to increased contraction of the uterus. This interaction can be explained by

Accepted Answer

Positive feedback describes a cycle in which an initial stimulus or event leads to a response that increases the magnitude of the stimulus, leading to a greater response. This process continues until a threshold is reached, at which point the system can rapidly transition to a new state. In the case of childbirth, the pressure on the cervix causes the uterus to contract, which in turn pushes the infant further down, leading to more pressure on the cervix and stronger contractions. This cycle continues until the infant is born.

Question 8

A lizard lives in a desert environment where the temperature is low at night and high during the day. What might this animal do to maintain the most stable body temperature?

Accepted Answer

By staying in a burrow during the night, the lizard can avoid the low temperatures. During the day, the lizard can shuttle between the sun and shade on the surface to regulate its body temperature by either warming up or cooling down. This allows the lizard to maintain the most stable body temperature possible in a desert environment where temperatures fluctuate greatly between day and night.

Question 9

In the experiment graphed below, researchers heated and cooled the hypothalamus of a mammal and determined the metabolic rates at different environmental (ambient) temperatures. Based on this experiment, which of the following statements is true?

Accepted Answer

The answer of In the experiment graphed below, researchers heated...

Question 10

What is the difference between negative feedback mechanisms and positive feedback mechanisms?

Accepted Answer

Negative feedback mechanisms work to return a system to a set point or equilibrium by counteracting any deviation from that point. Positive feedback mechanisms, on the other hand, amplify a response or deviation away from the set point, rather than returning the system to equilibrium.

Question 11

Small endotherms can extend the period over which they can survive without food by dropping body temperature during the portion of the day or night when they would normally be inactive. This adaptive hypothermia is called _______.

Accepted Answer

The answer of Small endotherms can extend the period over...

Question 12

A state of below-normal body temperature is called _______. When this condition is regulated, lasts for days or weeks, and is characterized by very low body temperatures, it is called _______.

Accepted Answer

The answer of A state of below-normal body temperature is...

Question 13

Which of the following statements about fever is true?

Accepted Answer

Fever is a higher-than-normal body temperature that is regulated by chemicals called pyrogens that reset the body's thermostat to a higher set point. It is not always dangerous and fever-reducing drugs are not always necessary or recommended. Fever is a natural response to infection or inflammation and can actually help the body fight off pathogens by activating the immune system.

Question 14

Use the following to answer questions: Refer to the graph below. -The "winter fish" has a Q₁₀ of _______; the "summer fish" has a Q₁₀ of _______.

Accepted Answer

The answer of Use the following to answer questions:
Refer to...

Question 15

Which of the following is a characteristic unique to connective tissue?

Accepted Answer

Connective tissue is characterized by a loose array of cells embedded in an extracellular matrix, which gives it a unique structure and function compared to other types of tissue. This matrix can contain fibers, such as collagen and elastin, as well as ground substance, which is a complex mixture of proteins and carbohydrates that supports the cells and provides mechanical strength to the tissue. Connective tissue can be found in various organs and structures throughout the body, including bone, cartilage, adipose tissue, and blood vessels.

Question 16

Elephants use their ears to release heat to the environment. What mechanisms might they employ to increase heat loss from the ears?

Accepted Answer

Elephants increase heat loss from their ears through increased convection by flapping their ears, and increased blood flow to the ears, which allows for greater heat transfer to the environment. Moving into the sun or covering their ears with dust would not increase heat loss.

Question 17

Which of the following contributes to the proper maintenance of homeostasis in the bodies of animals?

Accepted Answer

All of the listed factors contribute to the proper maintenance of homeostasis in animals. pH buffering of the blood helps regulate acidity and alkalinity levels; control of blood flow to the skin helps regulate body temperature; production of hormones regulates numerous bodily functions; and detection of external environmental conditions by the sensory system helps animals respond to changes in their surroundings.

Question 18

In an environment with an ambient temperature lower than an animal's core body temperature, which of the following would be an inappropriate physiological or behavioral response if the animal needed to eliminate excess body heat?

Accepted Answer

Inhibiting blood flow to peripheral vessels would be inappropriate for eliminating excess body heat, as it reduces heat loss by keeping blood away from the skin surface.

Question 19

A number of physiological processes can undergo acclimatization. Which of the following statements about acclimatization is false?

Accepted Answer

Not all multicellular animals are capable of acclimating to all the environmental changes they face. Some animals may be limited in their acclimation abilities due to genetic and physiological constraints.

Question 20

Which of the following statements about hypothalamic function is false?

Accepted Answer

Hypothalamic thermal set points can change in response to various factors such as infection, metabolic disorders, and hormonal changes.

Quiz 40: Physiology, Homeostasis, and Temperature Regulation

Evaporative cooling is an effective way to increase heat loss, but it carries the physiological drawback of

In fast-swimming cool-water fishes such as sharks and tunas, which of the following contribute(s) to the generation and maintenance of core body temperatures in excess of ambient water temperatures?

Which of the following organ systems is not involved in the maintenance of homeostasis in humans?

Some animals use brown fat as a source of heat generation. Which of the following statements about brown fat is false?

On a hot day, an active dog will pant heavily and visit his water bowl frequently. Which of the following statements about the dog's condition or behavior is false?

During childbirth, the pressure exerted on the mother's cervix by the emerging infant leads to increased contraction of the uterus. This interaction can be explained by

A lizard lives in a desert environment where the temperature is low at night and high during the day. What might this animal do to maintain the most stable body temperature?

In the experiment graphed below, researchers heated and cooled the hypothalamus of a mammal and determined the metabolic rates at different environmental (ambient) temperatures. Based on this experiment, which of the following statements is true?

What is the difference between negative feedback mechanisms and positive feedback mechanisms?

Small endotherms can extend the period over which they can survive without food by dropping body temperature during the portion of the day or night when they would normally be inactive. This adaptive hypothermia is called _______.

A state of below-normal body temperature is called _. When this condition is regulated, lasts for days or weeks, and is characterized by very low body temperatures, it is called _.

Which of the following statements about fever is true?

Use the following to answer questions: Refer to the graph below. -The "winter fish" has a Q₁₀ of _; the "summer fish" has a Q₁₀ of _.

Which of the following is a characteristic unique to connective tissue?

Elephants use their ears to release heat to the environment. What mechanisms might they employ to increase heat loss from the ears?

Which of the following contributes to the proper maintenance of homeostasis in the bodies of animals?

In an environment with an ambient temperature lower than an animal's core body temperature, which of the following would be an inappropriate physiological or behavioral response if the animal needed to eliminate excess body heat?

A number of physiological processes can undergo acclimatization. Which of the following statements about acclimatization is false?

Which of the following statements about hypothalamic function is false?

Quiz 40: Physiology, Homeostasis, and Temperature Regulation

Evaporative cooling is an effective way to increase heat loss, but it carries the physiological drawback of

In fast-swimming cool-water fishes such as sharks and tunas, which of the following contribute(s) to the generation and maintenance of core body temperatures in excess of ambient water temperatures?

Which of the following organ systems is not involved in the maintenance of homeostasis in humans?

Some animals use brown fat as a source of heat generation. Which of the following statements about brown fat is false?

On a hot day, an active dog will pant heavily and visit his water bowl frequently. Which of the following statements about the dog's condition or behavior is false?

During childbirth, the pressure exerted on the mother's cervix by the emerging infant leads to increased contraction of the uterus. This interaction can be explained by

A lizard lives in a desert environment where the temperature is low at night and high during the day. What might this animal do to maintain the most stable body temperature?

In the experiment graphed below, researchers heated and cooled the hypothalamus of a mammal and determined the metabolic rates at different environmental (ambient) temperatures. Based on this experiment, which of the following statements is true?

What is the difference between negative feedback mechanisms and positive feedback mechanisms?

Small endotherms can extend the period over which they can survive without food by dropping body temperature during the portion of the day or night when they would normally be inactive. This adaptive hypothermia is called _______.

A state of below-normal body temperature is called _______. When this condition is regulated, lasts for days or weeks, and is characterized by very low body temperatures, it is called _______.

Which of the following statements about fever is true?

Use the following to answer questions: Refer to the graph below. -The "winter fish" has a Q10 of _______; the "summer fish" has a Q10 of _______.

Which of the following is a characteristic unique to connective tissue?

Elephants use their ears to release heat to the environment. What mechanisms might they employ to increase heat loss from the ears?

Which of the following contributes to the proper maintenance of homeostasis in the bodies of animals?

In an environment with an ambient temperature lower than an animal's core body temperature, which of the following would be an inappropriate physiological or behavioral response if the animal needed to eliminate excess body heat?

A number of physiological processes can undergo acclimatization. Which of the following statements about acclimatization is false?

Which of the following statements about hypothalamic function is false?

A state of below-normal body temperature is called _. When this condition is regulated, lasts for days or weeks, and is characterized by very low body temperatures, it is called _.

Use the following to answer questions: Refer to the graph below. -The "winter fish" has a Q₁₀ of _; the "summer fish" has a Q₁₀ of _.