Thermoregulation Flashcards
what is my sensor of temperature?
thermoreceptors in the skin, viscera, and the brain
what tells me about my core temperature?
thermoreceptors in my brain and viscera
what tells me about the environmental temperature?
cutaneous thermoreceptors
why would I put thermoreceptors in my gut?
ingested food is potentially a threat
where are the thermoreceptors in the brain located?
the pre-optic and superoptic region of the hypothalamus
what is acting as the controller of core temperature?
the hypothalamus
which part of the hypothalamus responds to heat?
the anterior hypothalamus
what does the anterior hypothalamus do in response to heat?
heat loss behaviors
which part of the hypothalamus responds to cooling?
posterior hypothalamus
what does the posterior hypothalamus do in response to cooling?
heat production
what is the body’s equivalent to an air conditioner or furnace?
the anterior and posterior pituitary
what do the mechanisms of heat production all require?
the autonomic nervous system
what are the endocrinology ways of producing heat?
thyroxin and epinephrine release
what is non-shivering thermogenesis?
making heat by increasing metabolism not due to muscles (brown adipose tissue)
what is shivering to increase heat production mediated by?
the dorsomedial posterior hypothalamus
what area of the brain mediates voluntary activity increase to increase heat production?
the cortex
what is an example of non-shivering thermogenesis besides brown adipose tissue?
thyroxin increases metabolic rate
how is heat produced from brown adipose tissue?
hydrolysis of ATP via uncoupling proteins
what are two types of evaporative heat loss?
sweating and panting
What are three other examples of heat loss?
convention, conduction, and radiation
what is the sweat gland innervated by?
sympathetic cholinergic
what is the NT of sweat glands?
acetylcholine and it binds to a muscarinic receptor
low flow rates of sweat would have what concentration?
low water and high levels of Na+
high flow rates of sweat would have what composition?
high water and low levels of Na+
what is the major player of creating a fever?
prostaglandin E2
what does prostaglandin E2 do to the hypothalamus?
it increases the body’s set temperature point
the major hypothalamic nucleus associated with autonomic control is what?
the paraventricular nucleus
the paraventricular nucleus has outflow via what?
the dorsal longitudinal fasciculus
outflow via the dorsal longitudinal fasciculus from the paraventricular nuclei goes to what three places?
dorsal motor nucleus of the vagus, nucleus ambiguous, parasympathetic and sympathetic neurons in the spinal cord
