Chemistry 3 Body Temp and regulation

Question 1

Name the 4 methods of heat Transfer

Answer 1

Conduction
Convection
Radiation
Evapouration

Question 2

Explain heat loss thru conduction

Answer 2

Transferofheatfromawarm objecttoacool object
Occursusually betweensolids
Smallamountsofheatlost/gain
15% heat loss to air
3% to objects (ground)

Question 3

Explain heat loss thru convection

Answer 3

Transferofheatby movementofafluid(gasor liquid)betweenareasof differenttemperature
Slow process (newborns)
fan helps cool due to transfer of heat by moving warm air away from body.
15% heat loss to air by convection

Question 4

Explain heat loss thru radiation

Answer 4

Transferofheatinformofinfraredraysbetweena warmerandacoolerobject
Dull/orblackobjectsabsorbinfraredradiationmore readilythanlightones
Silveredsurfacesreflectinfraredrays
60% heat loss to radiation

Question 5

Explain heat loss thru process of evaporation

Answer 5

Conversionofaliquidtoavapour

22%heatlossfrombodyisvia evaporation

Question 6

Explain heat loss in newborns using 4 methods of heat loss, and

Answer 6

Evapouration. As fluid on skin dries, heat is lost.
Radiation from the warmth of the body
Convection if baby is placed in cool area
Conduction if baby placed on cold surface…..
prevention:
Dry baby,
wrap up in blanket
kept in warm place/next to mums skin, out of drafts

Question 7

Explain how body maintains body temperature

Answer 7

Heat production methods:
Basal Metabolism
muscular activity(shivering)
Thyroxine and epinephrine(stimulating effects on metabolic rate)
Temperature effect on cells