BIOL325 Physiology of Thermoregulation
Questions with Verified Correct Answers
What is an important environmental variable in human physiology?
Temperature
What are thermoreceptors?
Specialized nerve endings that organisms use to acquire sensory information about
temperature.
What is the role of higher-order neurons in the CNS regarding temperature?
They receive sensory information about temperature and contribute to the mechanisms that
regulate body temperature.
Which specific part of the vertebrate brain contains neurons that detect changes in body
temperature?
The hypothalamus.
Why is temperature considered a critical environmental variable for organisms?
It impacts survival, prompting organisms to use specialized systems (thermoreceptors and the
hypothalamus) to detect and regulate it.
What is the difference between an ectotherm and an endotherm?
It depends on where their heat comes from:
Ectotherms: Rely on external environmental sources (like sunlight or rocks) to regulate their
body temperature.
Endotherms: Generate their own heat internally through metabolic processes.
What is the difference between a poikilotherm and a homeotherm?
It depends on how stable their internal temperature stays:
Poikilotherms: Have a body temperature that fluctuates and changes along with the
environment.
Homeotherms: Maintain a constant, stable internal body temperature regardless of the
environment.
, What is the difference between a conformer and a regulator?
It depends on whether they change with the environment or fight it:
Conformers: Allow their internal conditions to match or change parallel to external
environmental shifts.
Regulators: Use internal mechanisms to actively control and maintain a stable internal
environment despite external changes.
What is the difference between cold-blooded and warm-blooded animals?
It is an informal, everyday way to describe how animals handle heat:
Cold-blooded: Animals whose body temperature changes with their surroundings, making them
feel cold to the touch when the environment is cold.
Warm-blooded: Animals that maintain a warm, steady body temperature, making them feel
warm regardless of the outside environment.
Where are the two locations in mammals that contain both types of thermoreceptors?
The external skin and the upper surface of the tongue.
What are the two (2) types of thermoreceptors found in mammals?
-Those that respond to warmth.
-Those that respond to cold.
How sensitive are human thermoreceptors to skin temperature changes?
Extremely sensitive; a human can feel an average skin temperature change of just 0.01°C.
How do thermoreceptors distinguish between warmth and cold?B
By their firing behavior (how they produce Action Potentials) in response to a specific stimulus.
At what skin temperature range do these receptors increase their firing?
When the temperature becomes different from 30-35°C (even though normal internal human
body temperature is 37°C).
How do warmth receptors and cold receptors respond to their specific stimuli?
Warmth receptors: Fire when the temperature becomes warmer.
Cold receptors: Fire faster when there is a cold stimulus.
What happens to both receptors if the temperature is much different from the normal range?
Both receptors reduce their response, following generalized sensory receptor behavior.
Questions with Verified Correct Answers
What is an important environmental variable in human physiology?
Temperature
What are thermoreceptors?
Specialized nerve endings that organisms use to acquire sensory information about
temperature.
What is the role of higher-order neurons in the CNS regarding temperature?
They receive sensory information about temperature and contribute to the mechanisms that
regulate body temperature.
Which specific part of the vertebrate brain contains neurons that detect changes in body
temperature?
The hypothalamus.
Why is temperature considered a critical environmental variable for organisms?
It impacts survival, prompting organisms to use specialized systems (thermoreceptors and the
hypothalamus) to detect and regulate it.
What is the difference between an ectotherm and an endotherm?
It depends on where their heat comes from:
Ectotherms: Rely on external environmental sources (like sunlight or rocks) to regulate their
body temperature.
Endotherms: Generate their own heat internally through metabolic processes.
What is the difference between a poikilotherm and a homeotherm?
It depends on how stable their internal temperature stays:
Poikilotherms: Have a body temperature that fluctuates and changes along with the
environment.
Homeotherms: Maintain a constant, stable internal body temperature regardless of the
environment.
, What is the difference between a conformer and a regulator?
It depends on whether they change with the environment or fight it:
Conformers: Allow their internal conditions to match or change parallel to external
environmental shifts.
Regulators: Use internal mechanisms to actively control and maintain a stable internal
environment despite external changes.
What is the difference between cold-blooded and warm-blooded animals?
It is an informal, everyday way to describe how animals handle heat:
Cold-blooded: Animals whose body temperature changes with their surroundings, making them
feel cold to the touch when the environment is cold.
Warm-blooded: Animals that maintain a warm, steady body temperature, making them feel
warm regardless of the outside environment.
Where are the two locations in mammals that contain both types of thermoreceptors?
The external skin and the upper surface of the tongue.
What are the two (2) types of thermoreceptors found in mammals?
-Those that respond to warmth.
-Those that respond to cold.
How sensitive are human thermoreceptors to skin temperature changes?
Extremely sensitive; a human can feel an average skin temperature change of just 0.01°C.
How do thermoreceptors distinguish between warmth and cold?B
By their firing behavior (how they produce Action Potentials) in response to a specific stimulus.
At what skin temperature range do these receptors increase their firing?
When the temperature becomes different from 30-35°C (even though normal internal human
body temperature is 37°C).
How do warmth receptors and cold receptors respond to their specific stimuli?
Warmth receptors: Fire when the temperature becomes warmer.
Cold receptors: Fire faster when there is a cold stimulus.
What happens to both receptors if the temperature is much different from the normal range?
Both receptors reduce their response, following generalized sensory receptor behavior.
