Which statement about heat exchange is true?
A) Conduction is the indirect transfer of heat between two objects that are at the same temperature.
B) Evaporation of sweat from the surface of the body warms the body.
C) Ectotherms, but not endotherms, can change the rate of heat exchange between their bodies and the external environment by changing blood flow to the skin.
D) Animals may lose heat by convection when they are exposed to wind with a temperature below that of their body surface.
E) Warm blood passing close to cooler blood picks up energy from the cooler blood.

Question

Quizplus · Accepted Answer

Convection is the transfer of heat by the movement of fluids (such as air or water). When animals are exposed to wind with a temperature below that of their body surface, they can lose heat by convection.

Note: A is incorrect because conduction is the direct transfer of heat between two objects that are at different temperatures. B is incorrect because evaporation of sweat from the surface of the body actually cools the body, rather than warming it. C is incorrect because both ectotherms and endotherms can change the rate of heat exchange between their bodies and the external environment by changing blood flow to the skin. E is incorrect because warm blood passing close to cooler blood does not pick up energy from the cooler blood, as both bloods are at the same temperature.

Which Statement About Heat Exchange Is True