Vasoconstriction ___________________________________.
a) increases heat loss by allowing the blood vessels to shed more heat at the surface of the body.
b) increases heat loss through conduction when the skin comes into contact with a cold surface.
c) decreases heat loss because expanding the capillaries is metabolically expensive, so keeping them constricted means less energy is lost as heat.
d) decreases heat loss by increasing the distance that the heat from the body has to travel to reach the external environment.
Vasoconstriction ___________________________________.
| a) | increases heat loss by allowing the blood vessels to shed more heat at the surface of the body. |
b) increases heat loss through conduction when the skin comes into contact with a cold surface.
c) decreases heat loss because expanding the capillaries is metabolically expensive, so keeping them constricted means less energy is lost as heat.
| d) | decreases heat loss by increasing the distance that the heat from the body has to travel to reach the external environment. |
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Which of the following are ways that Mark Watney can reduce his rate of heat loss to the environment when driving a rover without a heat source?
| a) His body can vasoconstrict the blood vessels of his extremities. b) He can drive during the day when the sun is providing a powerful source of radiant energy. c) He can put on as many layers of clothing as possible. d) All of these are ways he can reduce his rate of heat loss to the environment. | ||
