Skin, Exercise, Temperature Flashcards
1kcal =
4.618 kJ
1kg O2 consumed =
20.2 kJ (around)
Respiratory Quotient =
O2:CO2
Used to estimate BMR.
What biochemicals have the biggest effect on BMR?
Catecholamines (NAd, Ad)
and THYROXINE.
T3 and T4 do what in lab terms?
Increase oxygen consumption.
What’s the effect of the catecholamines?
Increase glycogenolysis.
how much does shell temperature fluctuate?
20-40oC
What mode of heat loss does evaporation represent?
convection
What mode of heat loss does contact with still air represent?
conduction
What is the formula for heat exchange?
C=Hc x A x (Tsk-Ta)
What’s Hc?
Convective Heat Transfer Coefficient?
When does sweat drip?
When secretion > evaporation.
How much heat do we lose from each 1g of water evaporated? (Latent heat of evaporation).
0.58 kcal
What’s ‘insensible’ perspiration?
Water we lose by simple diffusion through the skin - no regulated.
We lose about 900mL PER DAY wow.
When does sweating begin?
> 30oC
The kid with this disease in your class guarantees you an air conditioner.
Anhidrotic ectodermal displasia
Give the heat balance equation:
M = E+R+C+K+W+S
What are M and S in the heat balance equation?
M = metabolic rate S = storage (warmth of tissue)
-ve S means…
+ve S means…
negative: body cools down .
positive: body heats up.
Where are the “deep receptors” of heat?
Spinal Cord
Abdominal Viscera
Great Veins
Where’s the MOST of heat sensitive neurons?
- main body temp control
Hypothalamus
Where else was listed for thermoreceptors?
Midbrain and medulla.
What integrates temp sensory inputs?
Hypothalamic thermostat
What is the time scale for heat acclimatisation to kick in?
10 days.
