Question 1

Which mechanism of heat transfer is most affected by relative humidity during thermoregulation?

Accepted Answer

Evaporation

Question 2

A patient is exposed to an environment at 15°C (59°F). Which physiological response is most likely to occur to maintain core body temperature?

Accepted Answer

Shivering thermogenesis

Question 3

What is the primary integrating center for thermoregulation in the human body?

Accepted Answer

Hypothalamus

Question 4

Which of the following best describes the thermoneutral zone in humans?

Accepted Answer

The range of environmental temperatures where cutaneous blood flow alone can regulate body temperature

Question 5

During a fever, why does a person often feel chills even though their core body temperature is rising?

Accepted Answer

The hypothalamic set point is raised, so the body activates heat gain mechanisms to reach the new set point

Question 6

Which of the following equations correctly represents temperature balance in the human body?

Accepted Answer

$$Heat\ gain = Heat\ loss$$

Question 7

What is the physiological effect of cutaneous vasoconstriction during exposure to cold?

Accepted Answer

Decreased blood flow to the skin, promoting heat retention

Question 8

Which tissue is responsible for non-shivering thermogenesis, and what is its mechanism?

Accepted Answer

Brown adipose tissue; uncoupling electron transport chain from oxidative phosphorylation to generate heat

Question 9

A marathon runner collapses on a hot, humid day with a core temperature of 42°C (107.6°F). Which condition is most likely?

Accepted Answer

Heat stroke

Question 10

Which of the following is a feed-forward mechanism in thermoregulation?

Accepted Answer

Peripheral thermoreceptors in the skin monitoring surface temperature

Question 11

Which neurotransmitter stimulates eccrine sweat glands during heat loss in a warm environment?

Accepted Answer

Acetylcholine (ACh)

Question 12

If a person is exposed to an environment above the thermoneutral zone, which physiological response is most likely to occur first?

Accepted Answer

Increased sweat production

Question 13

Which of the following is NOT a mechanism of heat transfer between the body and the external environment?

Accepted Answer

Filtration

Question 14

A person with a core body temperature of 35°C (95°F) is most likely experiencing which condition?

Accepted Answer

Hypothermia

Question 15

Which of the following best explains why fever can enhance immune responses?

Accepted Answer

Fever raises the thermal set point, which can inhibit pathogen replication and improve immune cell function

Question 16

Which formula represents a positive temperature balance in the body?

Accepted Answer

$$Heat\ gain \u003e Heat\ loss$$

Question 17

Which effectors are activated by the hypothalamus to regulate body temperature?

Accepted Answer

Sweat glands and skeletal muscles

Question 18

Which of the following is a behavioral change that can help regulate body temperature in a cold environment?

Accepted Answer

Increasing physical activity

Question 19

What is the role of negative feedback in thermoregulation?

Accepted Answer

It maintains body temperature within a narrow range by counteracting deviations from the set point

Question 20

Which of the following statements about core body temperature is correct?

Accepted Answer

A core temperature above 41°C (106°F) can cause adverse effects

Thermoregulation: Mechanisms and Regulation of Body Temperature

Study Guide - Practice Questions