Hypothalamus Phys Flashcards
What parts of the body change temperature the most rapidly?
Feet, then hands, then skin
About how much does the core temperature change throughout the day?
1-2 degrees
Lowest at 6am
What are the cutaneous thermoreceptors most sensitive to?
Cold (10x as much as warm)
What information do the visceral thermoreceptors transmit?
Threats from ingested food that may change body temperature => thalamus
Where are the thermoreceptors of the brain located?
Pre-optic and superoptic region of hypothalamus
What are the thermoreceptors in the brain most sensitive to?
Heat (3x as much as cold)
What structure determines the set body temperature?
Hypothalamus
What region of the hypothalamus produces heat production behaviors in response to cooling?
Posterior region
What region of the hypothalamus produces heat loss behaviors in response to heating?
Anterior region
Why do babies need more adipose tissue?
Higher surface area in proportion to size => lose heat faster than adults
What part of the hypothalamus is responsible for shivering?
Dorsomedial posterior hypothalamus => increase motor neuron excitation
What division of the autonomic nervous system is involved in heat production?
Sympathetic
In non-shivering thermogenesis, what hormone is released in response to cold?
Thyroxin-Releasing hormone => Thyroxin
Epinephrine
What activates hydrolysis of ATP in brown fat?
Sympathetic fibers => Epinephrine
Transfer of heat between 2 objects that are not in physical contact is known as what?
Radiation
