Sweating is the primary mechanism of heat loss when it is too hot to establish a normal temperature gradient between the skin and the environment. This is because sweating evaporates from the skin, cooling it down. Vasodilation of skin vessels and increasing the insulative capacity of the skin are not direct effects of sweating.

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Sweating

Question 31

Multiple Choice

Sweating

A) causes vasodilation of the skin vessels
B) increases the insulative capacity of the skin so that less heat can be gained from the environment
C) is the only heat-loss mechanism available to the body when the environmental temperature is so high that a normal temperature gradient between the skin and the environment cannot be established
D) causes vasodilation of the skin vessels and is the only heat-loss mechanism available to the body when the environmental temperature is so high that a normal temperature gradient between the skin and the environment cannot be established.
E) all of these

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