30: Energetics and Thermoregulation

Question 1

Calorie

Answer 1

Energy consumption in the body is measured in these,equal to the energy required to increase the temperature of 1000 grams of water by 1o C.

Question 2

radiation

Answer 2

Under normal conditions at room temperature, about 60% of excess body heat is exchanged by this, 60%

Question 3

conduction

Answer 3

route for heat exchange is conduction- physical contact with an object of different temperature, 3%

Question 4

Convection

Answer 4

is a special case of conduction where heat is conducted to air, 15%

Question 5

evaporation

Answer 5

About 600 ml of water evaporates off the skin and out of the lungs each day, 22%

Question 6

brown fat

Answer 6

production of ATP and heat by mitochondria is uncoupled

Question 7

arrector pili

Answer 7

Contracting arrector pili muscles of the skin provides more insulation for fur bearing animals, but in man just causes “goose bumps”.

Question 8

pyrogen

Answer 8

any molecule that is able to increase the “set point”.