Keratin, a fibrous protein, would be found primarily in the .

If the body temperature drops below normal, heat is conserved by a(n) in the diameter of dermal blood vessels.

The secretion which lubricates and inhibits the growth of bacteria on the skin is called .

Hair develops from a group of epidermal cells at the base of a tube- like depression called a(n) .

Excessive exposure of the skin to UN. radiation may cause redness, edema, blisters, and pain. The presence of blisters classifies the burn as .

Dangerously high body temperatures occur sometimes in the elderly due to decreased blood supply to the dermis and .

Hair turns gray or white due to .

Except for red hair, the type of present is responsible for varying shades of hair color.