A)In a cold environment, arterioles in the dermis dilate to keep the skin warm.
B)In a warm environment, sweat glands secrete more sweat onto the skin surface.
C)In a cold environment, muscle tone decreases to prevent fatigue and waste of energy.
D)In a warm environment, blood flow through the dermis increases.
E)In a cold environment, digestion speeds up to produce more energy in the form of heat.
F)In a warm and humid environment, vasoconstriction is the most efficient mechanism of heat loss.

A)A substance or pathogen that causes a fever is a pyrogen.
B)A low fever may be beneficial in that WBCs become more active.
C)A pyrogen activates the heat gain mechanisms regulated by the thalamus.
D)A very high fever may cause brain damage because carbohydrates become denatured.
E)Some chemicals produced as part of inflammation are endogenous pyrogens.
F)A fever may be beneficial in that a higher temperature inhibits some bacteria.

A)36
B)41
C)46
D)51