Skin, Exercise, Temperature

Question 1

1kcal =

Answer 1

4.618 kJ

Question 2

1kg O2 consumed =

Answer 2

20.2 kJ (around)

Question 3

Respiratory Quotient =

Answer 3

O2:CO2

Used to estimate BMR.

Question 4

What biochemicals have the biggest effect on BMR?

Answer 4

Catecholamines (NAd, Ad)

and THYROXINE.

Question 5

T3 and T4 do what in lab terms?

Answer 5

Increase oxygen consumption.

Question 6

What’s the effect of the catecholamines?

Answer 6

Increase glycogenolysis.

Question 7

how much does shell temperature fluctuate?

Answer 7

20-40oC

Question 8

What mode of heat loss does evaporation represent?

Answer 8

convection

Question 9

What mode of heat loss does contact with still air represent?

Answer 9

conduction

Question 10

What is the formula for heat exchange?

Answer 10

C=Hc x A x (Tsk-Ta)

Question 11

What’s Hc?

Answer 11

Convective Heat Transfer Coefficient?

Question 12

When does sweat drip?

Answer 12

When secretion > evaporation.

Question 13

How much heat do we lose from each 1g of water evaporated? (Latent heat of evaporation).

Answer 13

0.58 kcal

Question 14

What’s ‘insensible’ perspiration?

Answer 14

Water we lose by simple diffusion through the skin - no regulated.
We lose about 900mL PER DAY wow.

Question 15

When does sweating begin?

Answer 15

> 30oC

Question 16

The kid with this disease in your class guarantees you an air conditioner.

Answer 16

Anhidrotic ectodermal displasia

Question 17

Give the heat balance equation:

Answer 17

M = E+R+C+K+W+S

Question 18

What are M and S in the heat balance equation?

Answer 18

M = metabolic rate
S = storage (warmth of tissue)

Question 19

-ve S means…

+ve S means…

Answer 19

negative: body cools down .
positive: body heats up.

Question 20

Where are the “deep receptors” of heat?

Answer 20

Spinal Cord
Abdominal Viscera
Great Veins

Question 21

Where’s the MOST of heat sensitive neurons?

- main body temp control

Answer 21

Hypothalamus

Question 22

Where else was listed for thermoreceptors?

Answer 22

Midbrain and medulla.

Question 23

What integrates temp sensory inputs?

Answer 23

Hypothalamic thermostat

Question 24

What is the time scale for heat acclimatisation to kick in?

Answer 24

10 days.

Question 25

What temp is critical temperature?

What temp is classical heat stroke?

Answer 25

40. 6oC

41. 3oC

Question 26

When you’re cold-acclimatised, how cold does your skin have to be to invite vasodilation?

Answer 26

15oC