Flashcards in Thermoregulation Deck (49)
What are the relative temperatures of the body from hottest to coldest?
When is the core temperature the lowest during the day?
When is the core temperature the highest during the day?
Where are thermoreceptors found?
Skin, viscera, and brain
Cutaneous thermoreceptors are bimodal. What does this mean?
They are both temperature and touch sensitive
Are there more warm or cold sensitive cutaneous thermoreceptors?
Cold sensitive (10x more)
What do cutaneous thermoreceptors tell us about?
What do visceral thermoreceptors sense?
Core temperature and threats to maintenance of the core temperature.
What does the visceral thermoreceptors contact about threats to maintenance of core temperature?
What is an example of a threat to core temperature?
Food intake (ice cream, hot soup, etc)
Where are thermoreceptors located in the brain?
Pre-optic and superoptic region of hypothalamus.
Are there more warm or cold sensitive brain thermoreceptors?
Warm sensitive (3x more)
What is the core temperature of most humans in the morning?
The hypothalamus has the connections to control the _______, _______, and _______ changes that are part of thermoregulation.
hormonal; autonomic; behavioral
The hypothalamus is the controller for body temperature:
1) Determining _____ ______.
2) Receiving info about ______ _______.
3) __________ ______ _____ ____.
deciding what to do
What 3 things change set point?
sleep, exercise, and fever
Sleep _____ set point.
Exercise _______ set point.
Fever ______ set point.
The ______ part of the hypothalamus responds to heat and causes heat loss behaviors.
The ______ part of the hypothalamus responds to cooling and causes heat production behaviors.
What are the 4 mechanisms of heat production?
3) muscular activity
4) non-shivering thermogenesis
Muscular activity increases body temperature by _____ and increasing ______ ______ via the _____.
shivering; voluntary activity; cortex
What is shivering mediated by?
the dorsomedial posterior hypothalamus by increasing motoneuron excitation
Non-shivering thermogenesis produces heat by a strong ______ ______, increasing _____ _____, and by _____ adipose tissue.
hormonal influence; food intake; brown
The hormones that influence non-shivering thermogenesis, are _____, which is stimulated by cold and increases metabolic rate, and ______.
Another mechanism of non-shivering thermogenesis is increasing food intake which leads to an _______ ___ ______.
increase in metabolism
Brown adipose tissue increases heat production in non-shivering thermogenesis by _______ ________ for initiation.
Brown adipose tissue produces heat by ____ _______ ______ of ATP via uncoupling proteins leads to more heat production.
low efficiency hydrolysis