16. How is body temperature maintained?

Question 1

What are the three zones for body temperature and how are they defined?

Answer 1

1. Homeothermic zone = physiological boundaries. Stay same temperature by physiological processes (e.g. sweating). Maintaining 37*C
2. 2. Thermoneutral zone (TNZ): Metabolic rate does not change (not non-shivering thermogenesis or whatever)
3. 3. Comfort zone: feeling nice (mood e.g.)

Question 2

Homeothermic zone: heat production vs environmental temp. is/is not constant

Answer 2

is not constant

Question 3

Thermoneutral zone: heat production vs environmental temp is/is not constant

Answer 3

is constant. No consequences for energy requirements.

Question 4

The lines bordering the UCT’s and LCT’s at different metabolic rates = ?

Answer 4

Lines of passive heat loss. heat gain/loss without sweating or shivering. By radiation, conduction, convection.

Question 5

What do you reach when lines of passive heat loss are extrapolated?

Answer 5

When the line is extrapolated, you reach skin temperature.

Question 6

Passive heat loss is influenced by …

Answer 6

by skin temperature (Ts), insulation (I), S (surface)

Question 7

What is on the Y-axis of a heat diagram?

Answer 7

Heat load/heat loss (maintenance)
p.157

Question 8

Explain meaning of roman letters p.158

Answer 8

ok

Question 9

Repeat heat graph on page 159

Answer 9

ok