Thermoregulation Flashcards
Response to high heat?
When it is hot, the blood is sent to the skin → the warmer the skin the more heat will be exerted to the environment
Response to cold?
When it is cold, the vessels of the periphery are constricted to maintain heat at the core → also the gradient of heat exchange with the environment is reduced
True or False,
Thermometers provide a accurate temperature measurements
FALSE
When we measure the temperature, we are measuring the periphery temperature so it is an estimation
But to get a more precise measurement → temperature rectale
Lower and higher limit for temperature
There are two types, cutanous and internal
internal:
<28 = arret cardiac
>40.5 = coup de chaleur, CNS issues
cutanous:
<10* loss of limb
34 basal cutanous temperature, max it can reach
What are the Thermoreceptors and what is special?
TRP receptors → activated at different temperatures
Allows us to perceive different temperatures
What is the main response activated by the CNS?
When activated, the signal is sent to the cortex → behavioral response to condition
What are cheap vs expensive changes?
physiological response to vasodilate or vasoconstrict → to the hypothalamus
The hypothalamus will start with either vasodilation or vasoconstriction (cheap)
IF the temperature keeps changing can go to sweating or shivering (very expensive responses)
What does ACh stimulate?
Frissonnement : ACh
Vasodilation: ACh
Sudation: ACh
What signal triggers Vasoconstriction?
Noreadrenaline
For the thermogenese function, what does a + or - Sfactor mean?
The S factor (storage; gain or loss)
If + → augmentation de la temperature interne
if - → diminution de la temperature interne
Why do we say that the body temperature control is not like a thermostat?
although the “heat loss” factors area activated and they reach the point of losing as much heat as we are gaining → it will not reduce the body temperature → it will only maintain the body at this new stable point → this is how elite sport players can maintain a 40*C body temp → not a thermostat
True or False,
thermolyse and thermogenesis will always balance out
FALSE
We can have cases when it is not possible to increase our thermolyse up to reach thermogenesis →
for example if the air is too humid or the room is too hot → cannot sweat easily
for example if we are under hydrated → cannot sweat easily
Why is drinking water important when exercising?
When exercising, body temperature rises -> need to reduce it -> one way to do that is sweating
if there is no water in the system, sweating is harder
hence, drink water
