The integumentary system performs many protective functions:
Reduction in body water loss
Acts as a barrier that prevents microorganisms and other foreign substances from entering the body
Protects underlying structures against abrasion
Melanin absorbs ultraviolet light and protects underlying structures from its damaging effects
Hair protection: The hair on the head acts as a heat insulator, eyebrows keep sweat out of the eyes, eyelashes protect the eyes from foreign objects, and hair in the nose and ears prevents the entry of dust and other materials.
The nails protect the ends of the fingers and toes from damage and can be used in defense.
