An agricultural worker is picking fruit on a day when the air temperature is 106 °F. Which of the following processes will most likely be occurring while he works?
A)
Conduction of heat from the air will be heating his skin surface and raising his core temperature.
B)
Blood volume at his skin surface will be increasing to dissipate heat.
C)
His autonomic nervous system will be stimulating him to sweat.
D)
Radiation from his skin surfaces will be dissipating heat into the environment.
Ans:
B
Feedback:
In response to high temperatures, blood volume at the surface increases in order to dissipate heat. Heat exchange between his body and the air is radiation, not conduction, and the sympathetic, not autonomic, nervous system will be in control of the sweating process. Because the air temperature exceeds his body temperature, he will not be able to lose heat in this way.
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