chapter 24

Question 1

heat exchange mechanisms

Answer 1

radiation
conduction
convection
evaporation

Question 2

radiation

Answer 2

loss of heat in the form of infrared rays
50% of heat lost by body is by radiation

Question 3

conduction

Answer 3

transfer of heat between two objects that are in direct contact

Question 4

convection

Answer 4

transfer of heat that occurs due to circulating air

Question 5

evaporation

Answer 5

the body is cooled as heat is absorbed by water to escape as a gas

Question 6

insensible water loss

Answer 6

basal level of body heat loss due to continuous evaporation of water from the lungs, mouth and skin

Question 7

sensible water loss

Answer 7

sweating

Question 8

thermoregulatory center of the hypothalamus is composed of

Answer 8

heat promoting center (increase)
heat loss center

Question 9

what sends information about body temp to anterior portion of hypothalamis

Answer 9

peripheral thermoreceptors
central thermoreceptors

Question 10

heat promoting mechanisms

Answer 10

1. vasoconstriction of cutaneous blood vessels
2. shivering
3. increase metabolic rate
4. thyroxine release

Question 11

heat loss mechanisms

Answer 11

vasodilation of cutaneous blood vessels
noticeable sweating; only works well in dry heat
water moves from high to low concentration