The skin has several different and important functions. It
provides protection from both injury (such as abrasion) and dehydration. Since
outer skin cells are dead and keratinized, the skin is waterproof, thereby
preventing fluid (water) loss. The skin’s waterproofing also prevents water
from entering the body when a person is immersed. The skin is a barrier against
invasion by bacteria and viruses and is involved in the regulation of body
temperature. It is the site for the synthesis of an inactive form of vitamin D.
In addition, the skin contains receptors that receive the sensations of touch,
vibration, pain, and temperature.
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