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29 Cards in this Set
- Front
- Back
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what is the whole body heat balance equation
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(metabolism-work done on environment) - Heat loss = storage of heat
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what are the main sources of heat in the body? what about the main ways to loose heat in teh body
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Source: metabolism
Loose: ratiative Coventive Evaporative Metabolism- Heat loss = Stored heat |
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how do you determine stored heat
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heat source - heat loss = storage
(metabolism-work done on enviornment) - (conductive + convective + evaporative heat loss) = stored heat |
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what things can let us gain heat other than metabolism (mm get hot when they work)
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BMR
muscular activity postural changes thermic effect of food environment hormones **with all of these things that make heat we still jsut have: conductive, convective radiation, evaporative ways to have heat loss |
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how do we maintain body temp in exercise
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sweat, evaporative cooling
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what is radiation
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energetic particles move throuh a medium or space
the sun! E rays are transferred through air |
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what is conduction
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heat transfer through matter, must TOUCH
not important in exercise |
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what is convections
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loosing heat across skin through air or water
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what is evaporation
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water vaporizes from skin and respiratory passage to cool us
MOST IMPORTNAT IN EXERCISE |
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what is the most and least important mech of het loss in exercise
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Most: evaporation
Least: conduction |
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what is the process where energetic particles pass through space or a medium
waht about when you loose heat through the movemnt of air or water on skin |
radiation
convection (like wind) |
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what does the skin do to alter heat loss
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it can increase or decrease Blood flow
the more BF you have to skin the more youcool |
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how can we dissipate heat by radiation
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well in phx we cant, we are 98 and the sun is 115 so there is no gradiant for heat to leave us
if it was 40 out and we were 98 we could loose het that way Rate of heat loss = C (skin temp-radiant temp)(SA) |
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what is the formula to determine heat dissipation via radiation
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rate of heat loss=
Constant (skin temp-radiant temp) (SA of body) |
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what is the mechanism for cooling by convection
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as you run the air moves past you and cools you
heat loss = (skin temp-ambient temp) (SA) |
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if you were in air and water of the same temp what feels colder, why
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water is colder bc there is a greater heat transfer by convection in water
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why dont you get as hot when your in cooler water
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more convection cooling
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tell me about evaporaion
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most important mech for cooling during exercise
Decreased ability with humidity increased by air velocity |
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what type of heat loss is inhibited by pads/clothing
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evaporative heat loss
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waht does this formula tell us
(metabolism- work dont on environment) - Heat loss (radiative+convective+ evaporative) |
equal to storage of heat
**while body heat balance equation |
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what is the mech that happens when you are cold and need to warm up
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1. mm shivers, increased metabolism and heat
2. message to hypothalamus 3. vasoconstriction of skin to prevent heat loss 4. body temo increases |
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what is hte mech that happens when you are warm and need to cool off
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1. your hot and send signal to hypothalamus
2. increased BF to skin to cool off 3. Increased activity in sweat glands, sweat for evap cooling 4. body temo decreaess |
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what is the main central control for regulating body temp
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hypothalmus
**there aer central and peripheral receptors |
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info from the skin and core temp regeptors is integrated where
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hypothalamus, it gives output to BV, and mm, and sweat glands
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what re the temperature sensory in the skin like
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there are hot and cold
*one area of skin can have warm or cold, can have local responses **they send info the the hypothalamus **its the early warning sign bc it tells us about the enviornmental temperature |
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what happens to BF when you...
put heat put cold |
dialte
constrict |
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why do we have hot and cold receptors in teh skin
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to cover a wide range of temps
**cold covers a wider range |
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during exercise what do we need to balance as far as where blood goes
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1. the sm kk to supply them
2. the skin to cool off **cooling will eventually be comprimised |
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when do we have more blood perfusing the heart, when its cold or warm out
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cold, we dont need to send as much blood to the skin to cool it off
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