The basal metabolic rate isthe rate at which energy is produced in the body when a person is at rest.A 75 kg (165 lb) person of height 1.83 m (6 ft) has a body surface areaof approximately 2.0 m2. (a) What is the net amount of heat this personcould radiate per second into a room at 18°C (about 65°F) if his skin’ssurface temperature is 30°C? (At such temperatures, nearly all the heatis infrared radiation, for which the body’s emissivity is 1.0, regardless ofthe amount of pigment.) (b) Normally, 80% of the energy produced bymetabolism goes into heat, while the rest goes into things like pumpingblood and repairing cells. Also normally, a person at rest can get rid ofthis excess heat just through radiation. Use your answer to part (a) to findthis person’s basal metabolic rate.
The basal metabolic rate is
the rate at which energy is produced in the body when a person is at rest.
A 75 kg (165 lb) person of height 1.83 m (6 ft) has a body surface area
of approximately 2.0 m2. (a) What is the net amount of heat this person
could radiate per second into a room at 18°C (about 65°F) if his skin’s
surface temperature is 30°C? (At such temperatures, nearly all the heat
is infrared radiation, for which the body’s emissivity is 1.0, regardless of
the amount of pigment.) (b) Normally, 80% of the energy produced by
metabolism goes into heat, while the rest goes into things like pumping
blood and repairing cells. Also normally, a person at rest can get rid of
this excess heat just through radiation. Use your answer to part (a) to find
this person’s basal metabolic rate.
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